Morphological descriptions

The terminology used to describe gall wasp morphology follows other recent cynipid studies (^{Liljeblad et al., 2008}; ^{Melika, 2006}; ^{Melika et al., 2010}). Abbreviations for forewing venation follow ^{Ronquist and Nordlander (1989)}, and cuticular surface terminology follows ^{Harris (1979)}. Measurements and abbreviations used here include: F1-F12 for the 1st and subsequent flagellomeres; POL (post-ocellar distance) for the distance between the inner margins of the lateral ocelli; OOL (ocellar-ocular distance) for the distance from the outer edge of a lateral ocellus to the inner margin of the compound eye; and LOL (lateral-frontal ocelli distance) for the distance between lateral and frontal ocelli. The width of the forewing radial cell is measured from the margin of the wing to the Rs vein.

The information contained in the material examined sections is a verbatim transcription of the pinned labels attached to the adult wasps including symbols and abbreviations. Alfred Kinsey included the symbol “_⊕” to indicate the specimens naturally emerged from galls. Also, Kinsey designated most holotypes using a “Paratype” red label and crossing out the “Para-” to handwrite “Holo-” on top. We use the term “HoloParatype” to better reflect the verbatim transcription of Kinsey’s holotype labels, and to follow the terms used in previous studies (^{Cuesta-Porta et al., 2022}, ²⁰²³, ²⁰²⁴).

Bright-field images of adults were produced with a digital Leica DC500 camera attached to a Leica DM2700M compound microscope using the LAS Store&Recall software, followed by processing in Adobe Photoshop 6.0. SEM images of the new species were taken with the Stereoscan Leica-360 at low voltage (700V) and without coating, in order to preserve the specimens. For all species examined in this paper, descriptions are provided according to current morphological requirements as the original descriptions are often superficial.

Nomenclature of host plants

^{Denk et al. (2017)} reorganized the classification of Quercus, dividing the genus into the subgenera Cerris and Quercus. Subgenus Cerris includes 3 sections: Cyclobalanopsis (previously considered a subgenus), and the sections Ilex and Cerris from ^{Menitsky (1984)}. Subgenus Quercus includes 5 sections: Lobatae and Protobalanus as in ^{Nixon (1993)}, with the old section Quercus divided into 3 new sections: Quercus ‘sensu stricto’, Virentes, and Ponticae. The gall wasp species listed herein are associated with section Quercus subsection Leucomexicanae: Q. arizonica Sarg. (= Q. sacame Trel.), Q. chihuahuensis Trel., Q. deserticola Trel. (= Q. rexococana Trel.), Q. glaucoides Mart. & Gal., Q. grisea Liebm., Q. laeta Liebm., Q. magnoliifolia Née (= Q. haematophlebia Trel., = Q. macrophylla Née), Q. obtusata Humb. & Bonpl., Q. potosina Trel., Q. repanda Bonpl., Q. rugosa Née (= conglomerata Trel., = reticulata Bonpl., = rhodolphebia Trel.), Q. repando Bonpl., and Q. tardifolia Trel. There is only one record of an association to an oak in section Lobatae, Q. crassifolia Bonpl.

Taxonomic summary

Type material. Holotype, asexual female deposited in JP-V collection (UB), labeled as “MEX, Parque Nacional Bosque del Pedregal, Ciudad de México, Mexico, M. Serrano col. 206A, 2,437 m asl, [19∘17.283′ N, 99∘12.256′ W]” (white label), “Ex.Q. obtusata, (24.vi.2012) 26. vi.2012” (white label); “Holotype Korlevicandricus tlalpanus desig. JP-V 2013” (red label), “Andricus calvoi Pujade-Villar, Cuesta-Porta & Melika, J.-P.V det., asexual gen.” (white label). Paratypes (3 females): 1 female with the same data as the holotype; 2 females collected in the same place and host than the holotype, but with different collection dates (24.vi.2012) 27.vi.2012: 1 female; (3.x.2010) extr. vi.2011: 1 female.

Additional material.Two females collected in the same place and from the same host plant as the holotype (20. vi.2011). Both females were dissected from the galls on 16.vii.2013 (damaged material). Eight females deposited in the JP-V col. (UB): 1 female “Parque Nacional Bosque del Pedregal, Tlalpan, Ciudad de México, Mexico, (MEX096), Ex Quercus sp., (19.iv.12) 01.v.2012, M. Serrano leg.”; 1 female “Santa Fe, Denominación de Coajomulco, Ciudad de México, Mexico, (MEX362), Ex Quercus sp., (23.iv.2017): 1 female, D. Cibrián-Tovar leg.”; 5 females “Santa Fe, Coajomulco, Ciudad de México, Mexico, (MEX473), ExQ. laeta, (22.iii.2019) 14.v.2019: 5 females, U. Barrera-Ruiz & D. Cibrián-Tovar leg.”; 1 female “Sanctórum de Lázaro Cárdenas, Tlaxcala, Mexico, (MEX644), ExQuercus sp., (22.vi.2022) 30.vi.2022: 1 female, JP-V, VC-P, A. Equihua & E. Estrada-Venegas leg.”; 1 female “Peñón Blanco, Sierra Fría, San José de Gracia, Aguascalientes, Mexico (MEX772), ExQuercussp., (12.ii.2022) extracted: 1 female, R. Clark leg.”; 1 female “Puente Roto, Santa Catarina Ixtepeji, Oaxaca, Mexico, (MEX834), Ex Q. glabrescens, (25.i.2023) extracted: 1 female, R. Clark leg.”; 1 female “Carretera Maravatío-Morelia (Km. 177-178), Michoacán, Mexico, (MEX841), Ex Q. obtusata (SR-R det.), (18.vi.2023) 16−31.vii.2023: 1 female, A. Equihua & J. Pujade-Villar leg.”; 1 female “Peñón Blanco, Sierra Fría, San José de Gracia, Aguascalientes, Mexico, (MEX973), Ex Q. chihuahuensis, (20.ii.2023) extracted: 1 female, R. Clark leg.”.

Etymology. Species is named after Mr. Oriol Calvo Verderes, accused in 2019, one month after the protests in Barcelona against the sentence of the Catalan political prisoners.

Biology. The asexual generation is only known to induce galls onQ. obtusataHumb. & Bonpl., andQ. laeta (section Quercus, subsection Leucomexicanae, white oaks). The galls were collected between March and June, adults emerged between May and June.

Distribution. Mexico: Ciudad de México, and Estado de México.

Andricus geniale(^{Kinsey, 1937}), comb. rev. Figs. 4a-e, 5a-d, 6a-d

Femuros genialeKinsey, 1937: in ^{Kinsey, 1937b: 466-467}, female; gall; ^{Pujade-Villar & Ferrer-Suay, 2015: 8}. Andricus geniale (Kinsey): ^{Weld, 1952: 306}.

Diagnosis.Andricus geniale differs from all the Andricus species, except for the species here transferred toAndricus, which have tibial carina and the last femur swollen. It differs fromA. lusumcomb. rev. by having the body scarcely pubescent with the glabrous mesopleuron on all its surface, the internal margin of eyes parallel, hind femur without distal lobe; differs fromA. calvoisp. nov.,A. lusum, comb. rev., and A. perfectum comb. rev. for the LOL more than 1.2× as long as the diameter of lateral ocellus, the hind coxae and femora not swollen, and the propodeal carinae subparallel. Differs fromA. integrum, comb. rev. by having the reticulated lower face, the mesopleuron is smooth with sparse striae across mid-height of mesopleuron.

Redescription. Asexual female (Figs. 4a-e, 5a-d, 6a-c). Head, mesosoma dark brown to black, antenna dark brown; legs chestnut brown, except dark brown to black coxae; metasoma chestnut brown.

Head (Fig. 4a-d) trapezoid, broadest part on the toruli level, 1.2× as broad as high, or less, and slightly narrower than mesosoma in frontal view; with sparse setae; denser on lower face and postgena; 2.4× as broad as long in dorsal view. Gena alutaceous, broadened behind eye in frontal view, nearly as broad as cross diameter of eye in lateral view. Malar space alutaceous with distinct rugae radiating from clypeus and reaching eye; eye 1.7× as high as length of malar space. Inner margins of eyes parallel or only slightly converging ventrally; POL 2.0× as long as OOL, OOL 1.5× as long as diameter of lateral ocellus and 1.2× as long as LOL, all ocelli ovate, of same size. Transfacial distance 1.2× as long as height of eye; toruli located at mid height of eyes, frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye 1.3× as long as diameter of torulus; lower face with sparse setae, rugoso-reticulate, rugae orientated mainly dorsoventrally and units of impressed areas slightly elongated, smooth; without setae; slightly elevated median area sculptured like rest of lower face. Clypeus impressed, flat, trapezoid, broader than high, smooth, glabrous, with few long setae along ventral edge; ventrally rounded, not emarginate and without median incision; anterior tentorial pit rounded, distinct, epistomal sulcus distinct, clypeo-pleurostomal line well impressed. Frons uniformly alutaceous, without striae and setae, area between toruli and eye alutaceous; interocellar area rugose. Vertex rugose, occiput alutaceous, glabrous, with white long setae; postocciput and postgena glabrous, alutaceous-reticulate, with concentric lines around occipital foramen and postgenal bridge; posterior tentorial pit large, elongated, area below impressed; occipital foramen as high as height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci, which diverge toward occipital foramen, postgenal bridge anteriorly slightly broader than occipital foramen. Antenna (Fig. 4e) as long as head+mesosoma, with 11 flagellomeres, scape 2.0× as long as pedicel, pedicel 1.4× as long as broad; flagellomeres subsequently broadening until apical end; all flagellomeres with sparse white short setae; F1 slightly longer than F2 and 1.8× as long as pedicel; F2 1.2× as long as F3; F3 slightly longer than F4, F5 = F6 = F7, F8 until F10 equal in length; F11 1.8× as long as F10; placodeal sensilla on F3-F11.

Mesosoma (Figs. 5a-d, 6b) longer than high, with few white setae, setae denser along propleuron and on lateral propodeal area. Pronotum smooth, sparsely pubescent with delicate parallel striae; anterolateral impressed narrow area smooth, shining; propleuron coriaceous, smooth, shining in the dorsomedial part, with scattered white short setae. Mesoscutum uniformly alutaceous-reticulate, slightly broader than long (largest width measured across mesoscutum at level of base of tegulae), with white setae, denser along anterior parallel lines. Notaulus deep, distinct, complete, slightly obscured anteriorly; posteriorly converging; in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; anterior parallel line almost indistinct, slightly elevated, and finely alutaceous; parasidal line impressed, extending well above tegula; median mesoscutal line absent or in a form of very short, impressed triangle; circumscutellar carina broad, reaching notaulus. Mesoscutellum elongated, longer than broad, trapezoid, broadest part in posterior 1/4 of its length; disk of mesoscutellum dull rugose laterally and posteriorly, coriaceous in anteromedian part, overhanging metanotum, with sparse setae. Mesoscutellar foveae transverse, with smooth, shining bottom, divided by narrow elevated coriaceous central area. Mesopleuron smooth, shining with delicate striae starting at ventrocentral part and going across mesopleuron to anterodorsal edge; lower half of anterior margin elevated into a strong carina, followed by impressed narrow furrow with striated bottom, speculum and posterior margin of mesopleuron smooth, glabrous, without longitudinal striae; mesopleural triangle smooth, glabrous, with dense, long white setae; dorsal and lateral axillar areas coriaceous, matt, with sparse white setae; axillula with delicate parallel longitudinal striae; subaxillar bar smooth, glabrous, with parallel sides, posteriorly as high as height of metanotal trough; metapleural sulcus reaching mesopleuron in upper 1/3 of its height, delimiting broad triangular smooth area with dense setae; upper part of sulcus distinct. Metascutellum coriaceous, higher than height of smooth, glabrous ventral impressed area; metanotal trough smooth, glabrous, with dense white setae; central propodeal area rectangular, smooth, shining, with irregular strong rugae; lateral propodeal carinae distinct, broad, blackish, subparallel; lateral propodeal area smooth, glabrous. Hind coxa and femora slightly swollen, without apical lobe; hind tibia with internal carinae. Tarsal claws toothed, with acute basal lobe.

Forewing (Fig. 6a) as long as body, hyaline, with very short cilia on margins, veins brown; radial cell opened, 3.1× as long as broad; Rs and R1 not reaching wing margin; areolet indistinct. Rs+M on all length indistinct, invisible.

Metasoma (Fig. 6c) as long as head+mesosoma, slightly longer than high in lateral view; 2nd metasomal tergum extending to 3/4 length of metasoma in dorsal view, with dense patch of white setae anterolaterally; all terga and hypopygium micropunctate posteriorly, prominent part of ventral spine of hypopygium 5.2× as long as broad in ventral view. Body length 2.0-2.5 mm.

Gall (Fig. 6d) unilocular, located on the buds, easily separable, elongated-cylindrical, cup-shaped (sometimes globular), almost or totally closed at the top. External surface silvery to yellow-brown, often with a rough surface; darker when more mature, completely bare, densely scaly or purple. Base of galls enlarged but joined by a small central point to the branch. Internally, the base of the gall is quite solid and woody, containing a centrally located circular larval chamber which, although heavily encrusted, has a distinct cell wall; upper half hollow, cup-shaped, bounded by thin to fairly thick walls occupying more than one-third the diameter of the entire gall; the walls of the upper half of the gall are quite thick and often wrinkled. Diameter up to 8.0 mm and length up to 11.0 mm.

Taxonomic summary

Type material examined. Holotype: female deposited in the AMNH “Durango, 2 N Dgo6500. Gall 11.8.31, female Spr.'32”, “Q. undataKinsey Coll.” (white labels), “F. geniale Holotype” (red label), “AMNH_IZC 00322882” (white label with a QR code). Paratypes: 2 females deposited in the AMNH: “Durango, 2 N Dgo6500. Mex_⊕, 11.8.31, female Spr.'32”, “Q. undataKinsey Coll.” (white labels), “F. geniale Paratype” (red label); a female with the same data at HMNH.

Additional material. Two females (AMNH): 1 female “Durango, 2 N, Dgo., 6500. Mex_⊕, 11.8.31, female Spr.'32”, “Q. undata Kinsey Coll.”, “F. geniale Kinsey coll. 37”; 1 female “Canatlan, 7N, Dgo., 7400', Mex._⊕, 11.9.31, female”, “Q. undata Kinsey coll”, “F. geniale Kinsey coll. 37”.

Biology. Only the asexual generation is known; adults emerge in spring. Galls on Q. undata Trell. (sectionQuercus, subsection Leucomexicanae, white oaks) (^{Kinsey 1937b}).

Distribution. Mexico: state of Durango (^{Kinsey, 1937b}).

Andricus integrum (^{Kinsey, 1937}), comb. rev.

Figs. 7a-f, 8a-e, 9a-c

Femuros integrumKinsey, 1937; in ^{Kinsey, 1937b: 467-468}, female, gall; ^{Pujade-Villar & Ferrer-Suay, 2015: 8}. Andricus integrum (Kinsey): ^{Weld, 1952: 306}.

Diagnosis. Differs from all the Andricus species, except for the species here transferred toAndricus, which have tibial carina and the last femur swollen. It differs fromA. lusumcomb. rev. by scarcely pubescent body, with mesopleuron glabrous on its entire surface, the internal margin of eyes parallel, the hind femur without distal lobe; differs from A. calvoi sp. nov.,A. lusumcomb. rev., and A. perfectum comb. rev. by the LOL which is more than 1.2× as long as the diameter of lateral ocellus, the hind coxae and femora are not swollen, and the propodeal carinae subparallel. Differs from A. geniale comb. rev. by dull, rugose-reticulate lower face, with vertical carinae radiating from clypeus; the mesopleuron is completely striated, except for the smooth speculum.

Redescription. Asexual female (Figs. 7a-f, 8a-e, 9a-b). Head, mesosoma, antenna dark brown to black; legs dark brown except dark brown to black coxae; metasoma chestnut brown.

Head (Fig. 7a-d) trapezoid, broadest part on toruli level, 1.5× as broad as high and slightly narrower than mesosoma in frontal view, with sparse setae, denser on lower face and postgena; 2.2× as broad as long in dorsal view. Gena alutaceous, units of sculpture orientated dorsoventrally, elongated, giving striate aspect in lower part; gena broadened behind eye in frontal view, slightly narrower than cross diameter of eye in lateral view. Malar space with distinct rugae, radiating from clypeus and reaching eye, area between rugae matt, alutaceous; eye 1.9× as high as length of malar space. Inner margins of eyes parallel or only slightly converging ventrally. POL 2.0× as long as OOL, OOL 1.5× as long as diameter of lateral ocellus and only slightly longer than LOL. Transfacial distance 1.2× as long as height of eye; toruli located at mid height of eyes, frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye 1.5× as long as diameter of torulus; lower face with sparse setae, rugoso-reticulate, rugae radiating from clypeus and reaching toruli, slightly elevated median area sculptured like rest of lower face. Clypeus impressed, flat, rectangular, broader than high, smooth, glabrous, ventrally rounded, not emarginate and without median incision; anterior tentorial pit rounded, distinct, epistomal sulcus distinct, clypeo-pleurostomal line well impressed. Frons uniformly alutaceous, without striae and setae, area between toruli and toruli and eye alutaceous; interocellar area rugose. Vertex rugose, occiput alutaceous, glabrous, with white long setae; postocciput with delicate transverse striae, postgena glabrous, alutaceous-reticulate, around occipital foramen and postgenal bridge smooth, shining; posterior tentorial pit large, elongated, area below impressed; occipital foramen 2.0× as high as height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci, which diverge toward occipital foramen, postgenal bridge anteriorly broader than occipital foramen. Antenna (Fig. 7e) as long as head+mesosoma, with 11 flagellomeres, scape 2.0× as long as pedicel, pedicel subglobose, as long as broad; flagellomeres subsequently broadening until apical end; all flagellomeres with sparse white short setae; F1 slightly longer than F2 and 1.8× as long as pedicel; F2 1.2× as long as F3; F3 slightly longer than F4, F5 = F6 = F7, F8 until F10 equal in length; F11 1.8× as long as F10; placodeal sensilla on F3-F11.

Mesosoma (Figs. 7f, 8a-d) longer than high, with few white setae, setae denser along propleuron and on lateral propodeal area. Pronotum smooth, glabrous dorsally, with transverse striate laterally; anterolateral impressed narrow area smooth, shining; propleuron alutaceous, smooth shining, with scattered white short setae. Mesoscutum uniformly alutaceous-reticulate, slightly broader than long (largest width measured across mesoscutum at level of base of tegulae), with white setae, denser along anterior parallel lines. Notaulus deep, distinct, complete; posteriorly converging; in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; anterior parallel line, glabrous, indistinct; parasidal line impressed, extending well above tegula; median mesoscutal line absent or in a form of very short, impressed triangle; circumscutellar carina broad, reaching notaulus. Mesoscutellum elongated, longer than broad, trapezoid, with subparallel sides, broadest part in posterior 1/4 of its length; disk of mesoscutellum dull rugose laterally and posteriorly, reticulated in anteromedian part, overhanging metanotum, with sparse setae. Mesoscutellar foveae transverse, with smooth, shining bottom, divided by narrow elevated smooth central area. Mesopleuron shining in between striae going across mesopleuron, anteriorly mesopleuron with narrow foveolate stripe, lower half of anterior margin elevated into a strong carina, followed by an impressed narrow furrow with bottom striated, speculum smooth, glabrous, without transverse longitudinal striae; mesopleural triangle smooth, glabrous, with dense, long white setae; dorsal and lateral axillar areas alutaceous, matte, with sparse white setae; axillula with delicate parallel longitudinal striae; subaxillar bar smooth, glabrous, with parallel sides, posteriorly as high as height of metanotal trough; metapleural sulcus reaching mesopleuron in upper 1/3 of its height, delimiting broad triangular smooth area with dense setae; upper part of sulcus distinct. Metascutellum with longitudinal rugae, 2.0× as high as height of smooth, glabrous ventral impressed area; metanotal trough smooth, glabrous, with dense white setae. Central propodeal area rectangular, smooth, shining, without irregular rugae; lateral propodeal carinae slightly bent outwards (parallel in the holotype), distinct, broad, blackish; lateral propodeal area smooth, glabrous, with long dense white setae. Nucha dull rugose dorsally, with parallel sulci laterally. Hind coxa and femora swollen, femora with acute basal lobe (Fig. 9a). Tarsal claws toothed, with acute basal lobe.

Forewing (Fig. 8e) above as long as body, hyaline, with very short cilia on margin, veins brown; radial cell opened, 2.8× as long as broad; Rs and R1 not reaching wing margin; areolet indistinct. Rs+M on all length indistinct, invisible.

Metasoma (Fig. 9b) as long as head+mesosoma, slightly longer than high in lateral view; 2nd metasomal tergum extending to 3/4 length of metasoma in dorsal view, with dense patch of white setae anterolaterally; all terga and hypopygium micropunctured posteriorly, prominent part of ventral spine of hypopygium 7.2× as long as broad in ventral view. Body length 2.1-2.6 mm (according to ^{Kinsey, 1937b}).

Gall (Fig. 9c). Similar to A. geniale but a little smaller: diameter up to 7 mm, length up to 10 mm.

Taxonomic summary

Type material examined. Holotype: female deposited in the AMNH: “S. Luis Potosí, S.L.P. 15 W, 8000, Mex. _⊕, Gall 11.3.31, female 1932”, “Q. potosina Kinsey Coll.” (white labels), “F. integrum HoloParatype” (red label), “AMNH IZC 00322883” (white label with a QR code). Paratypes: 2 females deposited in the AMNH “S. Luis Potosí, S.L.P. 15 W, 8000, Mex. _⊕, gall 10.3.31, female 1932”, “Q. potosina Kinsey Coll.” (white labels), “F. integrum Paratype” (red label); a female with the same data at HMNH.

Additional material. One female deposited in the AMNH “San Felipe, Gto, 20 SW, 3000 ', Mex. _⊕, 12.7.31, female spr. 32” “Q. chihuahuensis Kinsey Coll.”, “F. integrum Kinsey coll. 37”.

Biology. The asexual generation is only known to induce galls on Q. potosina Trell., Q. chihuahuensis Trell., Q. undata Trell., and Q. rugosa Né (= Q. reticulata Née) (section Quercus, subsection Leucomexicanae, white oaks), according to ^{Kinsey (1937b)}. Adults probably emerge in spring.

Distribution. Mexico: Guanajuato and San Luis Potosí (^{Kinsey, 1937b)}.

Andricus lusum (^{Kinsey, 1937}), comb. rev.

Figs. 10a-f, 11a-c

Femuros lusum Kinsey, 1937; in ^{Kinsey, 1937b: 468-469}, female, gall; ^{Pujade-Villar & Ferrer-Suay, 2015: 8}.

Andricus lusum (Kinsey): ^{Weld, 1952: 307}.

Diagnosis. Differs from all the Andricus species, except for the species here transferred to Andricus, which have tibial carina and the last femur swollen. This species belongs to the group of species that have the hind femur with a distal lobe and the LOL shorter than diameter of lateral ocelli, along with A. calvoi sp. nov. and A. perfectum comb. rev. It differs from A. perfectum comb. rev. by a faintly reticulate, shining lower face, carinae radiating from clypeus not extending towards toruli, the pronotum punctured with striae only on lateral margin and the notaulus incomplete, reaching more than 3/4 of length of mesonotum. Differs from A. calvoi sp. nov. by the space between notauli in the posterior margin on mesoscutum, which is subequal to the space between notauli and parasidal lines, and parasidal lines parallel or slightly bent outwards.

Redescription. Asexual female (Figs. 10a-f, 11a-b). Head, mesosoma dark brown to black, antenna dark brown; legs chestnut brown, except dark brown to black coxae; metasoma chestnut brown.

Head (Fig. 10a-c) trapezoid, broadest part below the toruli level, 1.5× as broad as high and slightly narrower than mesosoma in frontal view, with sparse setae, denser on lower face and postgena; 2.6× as broad as long in dorsal view. Gena finely reticulate, shining, broadened behind eye in frontal view, nearly as broad as cross diameter of eye in lateral view. Malar space alutaceous with distinct rugae radiating from clypeus and reaching eye; eye 2.1× as high as length of malar space. Inner margins of eyes parallel. POL 2.0× as long as OOL, OOL 1.5× as long as diameter of lateral ocellus and 1.3× as long as LOL, all ocelli ovate, of same size. Transfacial distance slightly longer than height of eye; toruli located at mid height of eyes, frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye 1.2× as long as diameter of torulus; lower face with dense setae, shining, faintly reticulate-alutaceous, rugae orientated mainly dorsoventrally and units of impressed areas slightly elongated, smooth; slightly elevated median area sculptured like rest of lower face. Clypeus impressed, flat, rectangular, broader than high, smooth, glabrous, with few long setae along ventral edge; ventrally rounded, not emarginate and without median incision; anterior tentorial pit rounded, distinct, epistomal sulcus distinct, clypeo-pleurostomal line well impressed. Frons uniformly reticulated, without striae, area between toruli and toruli and eye alutaceous; interocellar area rugose. Vertex rugose, occiput alutaceous, glabrous, with white long setae; postocciput and postgena glabrous, alutaceous-reticulate, with concentric lines around occipital foramen and postgenal bridge. Antenna of the type material broken past F4, scape 1.5× as long as pedicel, pedicel 1.2× as long as broad; all flagellomeres subsequently broadening until apical end; all flagellomeres with sparse white short setae; F1 slightly longer than F2 and 2.4× as long as pedicel; F2 slightly longer than F3; F3 slightly longer than F4, subsequent flagellomeres are missing.

Mesosoma (Fig. 10c-f) longer than high, with dense white setae, setae denser along propleuron and on lateral propodeal area. Pronotum with delicate parallel striae and impressed setae pits; anterolateral impressed narrow area smooth, shining; propleuron coriaceous, smooth shining in the dorsomedial part, with scattered white short setae. Mesoscutum uniformly alutaceous-reticulate, units transversally oriented on anterior half, posterior half alutaceous-reticulate with impressed setal points; slightly broader than long (largest width measured across mesoscutum at level of base of tegulae), with white setae. Notaulus deep, distinct, incomplete, absent in anterior 1/4-1/5 of mesoscutum length, anterior insertion in most posterior part distance between notauli shorter than distance between notaulis and side of mesoscutum; anterior parallel line distinct, slightly elevated, extending to 1/2 of mesoscutum length; parasidal line impressed, extending until shortly passed the tegula; median mesoscutal line absent; circumscutellar carina broad, reaching notaulus. Mesoscutellum elongated, longer than broad, trapezoid, broadest part in posterior 1/4 of its length; disk of mesoscutellum uniformly dull rugose, overhanging metanotum, with sparse setae. Mesoscutellar foveae transversally ovate, with smooth, shining bottom, divided by broad elevated rugose central area, half as wide as mesoscutellar fovea. Mesopleuron smooth, shining, with delicate striae going across mesopleuron, anteriorly with narrow foveolate stripe; speculum and posterior margin smooth, glabrous, without transverse longitudinal striae; mesopleural triangle coriaceous, glabrous, with dense, long white setae; dorsal and lateral axillar areas alutaceous with faint rugae, dull, with sparse white setae; axillula with delicate parallel longitudinal striae; subaxillar bar smooth, glabrous, triangular, posteriorly as high as height of metanotal trough. Metapleural sulcus reaching mesopleuron in upper 1/3 of its height, delimiting broad triangular smooth area with dense setae; upper part of sulcus distinct. Metascutellum rugose as high as the smooth, glabrous ventral impressed area; metanotal trough smooth, glabrous, with dense white setae; central propodeal area rectangular, smooth, shining, with irregular strong rugae. Lateral propodeal carinae distinct, broad, slightly bent outwards; central propodeal area smooth with faint rugae; lateral propodeal area punctured-smooth, uniformly pubescent. Nucha dull rugose dorsally, with parallel sulci laterally. Hind legs (Fig. 11b) with coxa broad, femur strongly broadened, with apical lobe; hind tibia with ventral carina reaching almost to the base of tibia; tarsal claws toothed, with acute basal lobe.

Forewing (Fig. 11a) above as long as body, hyaline, with very short cilia on margins, veins brown; radial cell opened, 3.2× as long as broad; Rs and R1 not reaching wing margin; areolet indistinct. Rs+M on all length indistinct, invisible.

Metasoma (Fig. 11b) as long as head+mesosoma, slightly longer than high in lateral view; 2nd metasomal tergum extending to 3/4 length of metasoma in dorsal view, with dense patch of white setae anterolaterally, with micropunctures; all subsequent terga and hypopygium with dense micropunctures, prominent part of ventral spine broken. Body length 3.0 mm (according to ^{Kinsey, 1937b}).

Gall (Fig. 11c). According to ^{Kinsey (1937b)}: galls are cylindric, with the thin-walled top half of the gall widely open or flaring, making the gall wide open cup-shaped with the whole solid. The base open cavity almost as wide as the whole gall. The gall silvery to yellow-to-brown; young galls quite scurfy, old galls naked. The diameter of the body of the gall up to 15.0 mm, averaging nearer 11.0 mm; the flared top up to 19.0 mm in diameter, length up to 19.0 mm, averaging near 15.0 mm.

Taxonomic summary

Type material examined. Holotype asexual female deposited in the AMNH: “Morelia, 14E; Mich 7000; Mex gall 12.27.31”, “Q. conglomerata, Kinsey Coll.” (white labels), “Femuros lusum HoloParatype” (red label), “AMNH_IZC 00327205” (white label with a QR code). Paratypes: only galls with the same data as the holotype.

Biology. The asexual generation is known for inducing galls on a single species of white oaks: Q. rugosa Née (= Q. conglomerata Trell.; section Quercus, subsection Leucomexicanae, white oaks). The single adult of this species (holotype) probably obtained after gall cut; galls were collected on December 27, 1931 (^{Kinsey, 1937b}).

Distribution. México: Michoacán (^{Kinsey 1937b}).

Andricus perfectum (^{Kinsey, 1937}), comb. rev.

Figs. 12a-f, 13a-c, 14a-d

Femuros perfectum Kinsey, 1937; in ^{Kinsey, 1937b: 469-470}, female, gall; ^{Pujade-Villar & Ferrer-Suay, 2015: 8}.

Andricus perfectum (Kinsey): ^{Weld, 1952: 306}.

Diagnosis. Differs from all the Andricus species, except for the species here transferred to Andricus, with tibial carina and the last femur swollen. This species belongs to the group of species that have the hind femur with a distal lobe and the LOL shorter than the diameter of lateral ocellus, A. calvoi sp. nov. and A. lusum comb. rev. Differs from those 2 species by dull rugose-reticulate lower face, with vertical carinae radiating from the clypeus towards the toruli, the pronotum completely striate with parallel curved striae, and the notaulus incomplete, reaching slightly more than half-length of mesonotum.

Redescription. Asexual female (Figs. 12a-f, 13a-c, 14a-c). Head, antenna dark brown; mesosoma blackish; legs chestnut brown, except dark brown to black coxae; metasoma chestnut brown.

Head (Figs. 12a-d, 13c) trapezoid, broadest part on the toruli level, 1.4× as broad as high and as broad as mesosoma in frontal view, with sparse setae, denser on postgena; 2.4× as broad as long in dorsal view. Gena alutaceous, units of sculpture orientated dorsoventrally, elongated, giving striate aspect of gena in its lower part; gena slightly broadened behind eye in frontal view, slightly broader than cross diameter of eye in lateral view. Malar space with distinct rugae radiating from clypeus and reaching eye, area between rugae smooth, shining; eye 2.2× as high as length of malar space. Inner margins of eyes parallel. POL 2.1× as long as OOL, OOL 1.7× as long as diameter of lateral ocellus and only slightly longer than LOL, lateral ocelli bigger than median ocellus. Transfacial distance subequal to height of eye; toruli located slightly above height of eyes, frons at least 2.0× shorter than height of lower face, diameter of antennal torulus 2.4× as long as distance between them, distance between torulus and eye 1.4× as long as diameter of torulus; lower face with sparse setae, delicately coriaceous, striae radiating from clypeus extending to 1/3 of lower face height; slightly elevated median area delicately coriaceous, on both sides with delicate striae radiating from clypeus and extending to 1/3 of lower face height. Clypeus convex, rectangular, broader than high, delicately coriaceous; ventrally rounded, not emarginate and without median incision; anterior tentorial pit rounded, distinct, epistomal sulcus distinct, clypeo-pleurostomal line well impressed. Frons dull rugose, without striae and setae, area between toruli and toruli and eye smooth, shining; interocellar area rugose. Vertex rugose, occiput alutaceous, glabrous, with white long setae; postocciput and postgena glabrous, with alutaceous-reticulate, around occipital foramen and postgenal bridge smooth, shining; posterior tentorial pit large, elongated, area below impressed; occipital foramen as high as height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci which diverge toward occipital foramen, postgenal bridge anteriorly broader than occipital foramen. Antenna (Fig. 12e) slightly longer than head+mesosoma, with 11 flagellomeres, scape 2.7× as long as pedicel, pedicel subglobose, as long as broad; flagellomeres flagellomeres from F1 until F7 of same width, with sparse white short setae; F1 2.0× and 2.4× as long as pedicel; F2 1.65× as long as F3; F3 slightly shorter than F4, F5 = F6 = F7, from F8 flagellomeres subsequently broadening until apical end, F8 until F10 equal in length; F11 1.8× as long as F10; placodeal sensilla on F2-F11.

Mesosoma (Figs. 12f, 13a-c, 14c) longer than high, with few white setae, setae denser along propleuron and on lateral propodeal area. Pronotum smooth, glabrous dorsally, laterally delicately uniformly coriaceous, without transverse striae; anterolateral impressed narrow area smooth, shining; propleuron alutaceous, smooth shining, with scattered white short setae. Mesoscutum uniformly alutaceous-reticulate, with distinct piliferous points scattered all over the mesoscutum, slightly broader than long (largest width measured across mesoscutum at level of base of tegulae), with white setae, denser along anterior parallel lines. Notaulus weakly impressed, narrow, incomplete, reaching to 3/4 of mesoscutum length; posteriorly converging; in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; anterior parallel line indistinct; parasidal line impressed, extending to the level of tegula; median mesoscutal line absent; circumscutellar carina broad, reaching notaulus. Mesoscutellum elongated, longer than broad, trapezoid, with subparallel sides, broadest part in posterior 1/4 of its length; disk of mesoscutellum uniformly dull rugose, overhanging metanotum, with sparse setae. Mesoscutellar foveae transverse, with smooth, shining bottom, divided by narrow elevated coriaceous central area. Mesopleuron alutaceous, delicate short transverse striae ventrally only in the anterolateral part, anteriorly mesopleuron with narrow foveolate stripe, speculum smooth, glabrous, without transverse longitudinal striae; mesopleural triangle delicately coriaceous, with dense, long white setae; dorsal and lateral axillar areas delicately coriaceous, matte, with sparse white setae; axillula with delicate parallel longitudinal striae; subaxillar bar smooth, glabrous, triangular in the highest posterior part as high as height of metanotal trough; metapleural sulcus indistinct, reaching mesopleuron in upper 1/3 of its height, delimiting broad triangular smooth area with dense setae; upper part of sulcus indistinct. Metascutellum with longitudinal rugae, as high as height of smooth, glabrous ventral impressed area; metanotal trough smooth, glabrous, with dense white setae; central propodeal area rectangular, smooth, shining, without irregular rugae; lateral propodeal carinae slightly bent outwards, distinct, broad, blackish; lateral propodeal area smooth, glabrous, with long dense white setae. Nucha dull rugose dorsally, with parallel sulci laterally. Hind femora (Fig. 14b) strongly broadened; hind tibia with ventral carina reaching almost to the base of the tibia. Tarsal claws toothed, with acute basal lobe.

Forewing (Fig. 14a) as long as body, hyaline, with dense cilia on margins, veins whitish, hardly traceable; radial cell opened, 2.8-3.2× as long as broad; Rs and R1 not reaching wing margin; areolet indistinct and Rs+M, indistinct, invisible.

Metasoma (Fig. 14b) as long as head+mesosoma, longer than high in lateral view; 2nd metasomal tergum extending to 3/4 length of metasoma in dorsal view, with numerous white setae anterolaterally, smooth, shining; all subsequent terga and hypopygium with micropunctures prominent part of ventral spine of hypopygium 2.4-3.5× as long as broad in ventral view. Body length 2.6-3.2 mm (according to ^{Kinsey, 1937b}).

Gall (Fig. 14d). Similar to A. geniale and A. perfectum, but larger (diameter up to 16 mm, never more than 13 mm in length), nearly globular or slightly elongated or flattened. In section, the upper cavity is exceedingly small occupying the upper half of the gall, never wider than larval chamber (often narrower), almost completely closed by very thick and solid walls, although a central pucker at the apex of the gall still indicates the opening to the cavity; outside of the gall silvery grey to purplish brown, conspicuously covered with a purplish-white bloom.

Taxonomic summary

Type material examined. Holotype: female deposited in the AMNH “Chilpancingo, Gro 6S, 4000', Mex gall 1.8.32, female 5.10.32”, “Q. macrophylla Kinsey Coll.” (white labels), “F. perfectum HoloParatype” (red labels), “AMNH_IZC 00322886” (white label with a QR code). Paratypes: 33 females deposited in the AMNH “Chilpancingo, Gro 6S, 4000, Mex; gall 1.8.32, 56 females 5.10.32”, “Q. macrophylla Kinsey Coll.” (white labels), “F. perfectum Paratype” (red label).

Biology. The asexual generation is only known to induce galls on Q. macrophylla Née (= Q. macrophylla Née; section Quercus, subsection Leucomexicanae, white oaks). Adults emerge from May to July (^{Kinsey, 1937b}).

Distribution. México: Guerrero (^{Kinsey, 1937b}).

Femuros Kinsey, 1937

Type species: Femuros repandae Kinsey, 1937.

Diagnosis. Only asexual females known. Femuros is characterized by having a lower head smooth or almost smooth, without radiating carina from clypeus or very short, neither malar sulcus, occipital carina visible behind the ocelli, with transscutellal articulation, winged forms, hind femur broadened on ventral margin near distal end, and an internal carina on the hind tibia. Some species of Andricus, Amphibolips, and Odontocynips can have broadened hind femur but in these cases the lower face is always sculptured (rugose and/or with radiating carina from clypeus). Very few Cynipini genera with transscutellar articulation lack facial striae and a malar groove: Dryocosmus, Eumayria, Heteroecus, and Kokkocynips. Eumayriella, unlike Femuros, is brachypterous, lacks scutellar pits and has a dorso-ventrally flat mesosoma. Heteroecus and Kokkocynips have sculptured face and simple tarsal claws, unlike Femuros; furthermore, the metanotum is sculptured in Kokkocynips (without sculpture in Femuros). Cynips have the head sculptured and, the mesoscutum and mesopleuron smooth or practically smooth (head smooth and sculptured, mesoscutum and mesopleuron in Femuros also agamic forms of Cynips have wide forming ventral spine provided with a dense truncated tuft in agamic forms (long spine without the apical tuft in Femuros). Dros has the head in frontal view smooth and mesoscutum also smooth but in Femuros the fronts and mesoscutum are sculptured. Finally, Sphaeroterus and some Neuroterus species have the lower face smooth, as Femuros, but have also malar sulcus (absent in Femuros); besides, in Neuroterus the transscutellal articulation is absent (present in Femuros).

Redescription. Asexual female. Head, mesosoma dark brown, chestnut brown to black, rusty brown or yellowish to yellow amber; antenna of the same color or paler than head; metasoma dark brown to reddish brown; mouthparts, legs yellowish-brown, light brown to dark brown, with coxae always darker.

Head alutaceous, with sparse setae, denser on lower face, rounded, trapezoid or transverse, 1.2-1.4× as broad as high and slightly broader than mesosoma in frontal view; 2.0-2.2× as broad as long in dorsal view. Gena alutaceous, either not or broadened behind eye in frontal view, narrower than cross diameter of eye in lateral view. Malar space alutaceous with striae radiating from clypeus and reaching eye, malar sulcus absent (Figs. 15a, 16a, 18a, 21a); eye 2.8-4.0× as high as length of malar space. Eyes parallel or slightly converging ventrally. POL 1.8-3.6× as long as OOL, OOL slightly shorter or 1.3-1.6× as long as diameter of lateral ocellus and nearly equal to LOL, all ocelli ovate, of same size (Figs. 16b, 18c, 21c). Transfacial distance slightly shorter or equal to height of eye; toruli located at mid-height or level with the lower half of eyes, frons higher than lower face, diameter of antennal torulus 1.3-2.0× as long as distance between them, distance between torulus and eye slightly shorter or 1.2-1.5× as long as diameter of torulus; lower face smooth, glabrous, alutaceous to delicately coriaceous, with white setae, with or without short delicate striae; slightly elevated median area alutaceous to delicately coriaceous, with few setae. Clypeus rounded, quadrangular or rectangular, nearly 2.0× as broad as high, smooth, glabrous, with few setae ventrally rounded, not emarginate and without median incision; anterior tentorial pit large, rounded, distinct, epistomal sulcus distinct, clypeo-pleurostomal line well impressed. Frons uniformly alutaceous, without striae and setae, interocellar area alutaceous. Vertex, occiput and postocciput alutaceous; postgena smoo²th or alutaceous, with or without setae; posterior tentorial pit large, elongated, area below impressed; occipital foramen slightly shorter or as high as height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci strongly diverge toward occipital foramen, postgenal bridge anteriorly slightly broader than occipital foramen. Antenna longer than head+mesosoma, with 12- 12 flagellomeres (in some specimens the suture between F12 and F11 hardly visible), pedicel longer than broad; flagellomeres subsequently broadening towards apical end; F1 1.6× as long as pedicel and 1.3× as long as F2; F2 1.1× as long as F3; F3 = F4 = F5, F5 1.1× as long as F6, F6 to F10 nearly equal in length; F11 2.1× as long as F10; placodeal sensilla on F3-F11(F12).

Mesosoma slightly longer than high, with a few white setae; dorsum along propodeum and laterally, Pronotum smooth, glabrous, with parallel striae and sparse setae laterally; propleuron smooth, glabrous. Mesoscutum uniformly and entirely reticulate, with a few white setae along notauli (Fig. 17a), slightly longer than broad (greatest width measured across mesoscutum level with base of tegulae). Notaulus complete, in some species indistinct in anterior 1/3, impressed in posterior 2/3 of mesoscutum length, notaular furrow alutaceous smooth; posteriorly strongly converging, anterior parallel line invisible or indistinctly impressed and extending to 1× of mesoscutum length; parasidal line marked with broad impressed area; median mesoscutum line absent or short and impressed only posteriorly; parascutal carina broad, reaching pronotum. Mesoscutellum ovate, slightly longer than broad; disk of mesoscutellum, rugose, reticulated or dull rugose only laterally and posteriorly, overhanging metanotum, glabrous or with sparse long setae; circumscutellar carina complete. Mesoscutellar foveae transverse, about 2.0× as broad as high, with smooth glabrous bottom; divided by narrow rugose elevated central carina. Mesopleuron entirely covered with delicate interrupted parallel striae, without setae or only setose ventrally (Figs. 19b, 22a); mesopleural triangle smooth, glabrous, with a few strong irregular striae and long white setae; dorsal and lateral axillar areas smooth, glabrous, without setae; axillula with delicate parallel longitudinal striae; subaxillular bar smooth, glabrous, triangular, posteriorly as high as height of metanotal trough; metapleural sulcus reaching mesopleuron at mid-height or slightly above, upper part of sulcus also distinct, sulcus separating smooth, glabrous area with some setae in lower part. Metascutellum smooth, glabrous or coriaceous, as high as height of trough; glabrous ventral impressed area; metanotal trough smooth, glabrous, without setae; central propodeal area smooth, glabrous, with or without delicate rugae in posterolateral part; several parallel indistinct, interrupted, incomplete lateral propodeal carinae bent outwards in mid-height or posterior 1/3 (Figs. 19c-22c); in some cases lateral carinae absent; lateral propodeal area smooth, with long white setae and piliferous points. Nucha with strong longitudinal sulci dorsally and laterally. Tarsal claws with basal lobe.

Forewing longer than body, hyaline, with distinct dense cilia on margin, veins dark brown, radial cell open, 3.2-4.5× as long as broad; Rs not reaching wing margin, R1 indistinct, less pigmented, not reaching wing margin; areolet small, triangular, closed and distinct. Rs+M inconspicuous, its projection reaching basalis slightly below or in lower half of its height.

Metasoma as long as or longer than head+mesosoma, slightly longer or shorter than high in lateral view; 2nd metasomal tergum extending to half-length of metasoma in dorsal view, with few white setae anterolaterally, without micropunctures; third and fourth terga smooth, glabrous, without micropunctures; subsequent terga without or with rare delicate micropunctures (Figs. 15d, 20b). Hypopygium with or without micropunctures, prominent part of ventral spine of hypopygium 2.3-5.1× as long as broad in ventral view, with a few white setae ventrally. Body length 1.5-2.5 mm.

Femuros bracteatus (^{Weld, 1944}), comb. nov.

Fig. 15a-d

Andricus bracteatus ^{Weld, 1944: 8}.

Diagnosis. Femuros bracteatus is most closely related to F. repandae and both differ from F. ruidum and F. ocri in having the POL around 1.5× as long as OOL, OOL 1.5× longer than diameter of lateral ocellus, the height of eye 2.0× longer than malar space, and the transfacial distance 1.3× as long as height of eye. Femuros bracteatus differs from F. repandae in the anterior parallel lines and parasidal lines of the same color as the rest of the mesoscutum; mesoscutellar foveae are divided by a wide rugose elevated area, while in F. bracteatus the mesoscutum with the anterior parallel lines and parasidal lines are darkened, chestnut colored; the mesoscutellar foveae are divided by a thin and sharp carina.

Redescription. Asexual female (Figs. 15a-b, 15d). Head, mesosoma, metasoma and legs reddish-brown, without darker areas in anterior parallel lines and parasidal lines; antenna dark brown, last flagellomere darker; tegula yellowish; Wing veins brown.

Head (Fig. 15c-e) transversally ovate, broadest part below toruli, broader than high and narrower than mesosoma in frontal view, with short dense white setae; 1.3× as broad as high in anterior view and head 2.0× as broad as long in dorsal view. Gena alutaceous to smooth, slightly broadened behind eye, as broad as cross diameter of eye, measuring along transfacial line. Malar space weak alutaceous, without striae radiating from clypeus, malar sulcus absent; eye 2.1× as high as length of malar space. Inner margins of eyes parallel. POL 2.6× as long as OOL, OOL as long as diameter of lateral ocellus and as long as LOI, all ocelli rounded, of same size. Transfacial distance 1.1× as long as height of eye; toruli located above mid height of head; frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye almost as long as diameter of torulus. The lower face almost smooth, raised central part below the toruli alutaceous, pubescent. Clypeus impressed, coriaceous, rounded ventrally, medially not incised, anterior tentorial pits distinct, epistomal sulcus and clypeo-pleurostomal line distinctly impressed. Frons uniformly coriaceous, without striae, with few setae, piliferous points (vibris); interocellar area coriaceous with piliferous points; space between lateral ocellus to compound eye almost smooth and shining. Vertex and occiput coriaceous; postocciput and postgena glabrous, alutaceous-reticulate, with concentric lines around occipital foramen and postgenal bridge; posterior tentorial pit large, elongated, area below impressed; occipital foramen as high as height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci, which strongly diverge toward occipital foramen, postgenal bridge anteriorly slightly broader than occipital foramen. Antenna (Figs. 15a-c) shorter than length of head + mesosoma, with 11 flagellomeres; pedicel 1.5× as long as broad; flagellomeres not broadening until apical end; F1 1.2× as long as F2 and 3.6× as long as pedicel; subsequent flagellomeres progressively shortened; F3 = F4, F5 = F6, F7 to F10 equal in length F11 longer than F10, sometimes F11 with a very inconspicuous suture and thus antenna with 12 flagellomeres; placodeal sensilla on F5-F11.

Mesosoma (Figs. 15a-c) 1.2× as long as high, concave in lateral view, pubescent. Sides of pronotum alutaceous, with white setae and weak and parallel carinae in upper lateroposterior part, anterolateral rim of pronotum inconspicuous. Mesoscutum 1.2× as broad as long in dorsal view; punctured, without rugae, pubescent, with dense piliferous points. Notaulus complete, deep, straight, converging posteriorly, in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; median mesoscutum line present, parapsidal lines and anterior parallel lines differentiated by alutaceous ‘sculpture’, circumscutellar carina absent. Mesoscutellum as long as broad, uniformly rugose; overhanging metanotum, with sparse long setae. Mesoscutellar foveae differentiated, delimited posteriorly by a broad rugose area, triangular, deep, with smooth bottom, separated by a median carina. Mesopleuron completely pubescent, weakly reticulate with delicate carinae and sparse setae anteriorly, speculum smooth and shining; mesopleural triangle alutaceous, with dense white setae, hiding the surface sculpture; dorsal and lateral axillar areas with delicate parallel longitudinal carinae, glabrous; axillula alutaceous, pubescent; subaxillular bar smooth, glabrous, triangular, posteriorly as high slightly shorter than high of metanotal trough; metapleural sulcus reaching mesopleuron in upper 1/2 of its height; upper part of sulcus distinct; lower part of sulcus delimiting big area with dense long white setae. Metascutellum subrectangular, coriaceous with some weak longitudinal carinae, curved ventrally; metanotal trough coriaceous, with dense setae; ventral bar of metanotal trough coriaceous dorsally and smooth ventrally; central propodeal area nearly smooth and glabrous; lateral propodeal carinae parallel by converging toward posterior end, lateral parts of propodeum uniformly alutaceous, densely pubescent. Nucha almost smooth and shining dorsally, with parallel sulci laterally. Legs (Fig. 15d) with hind coxa broad, hind femur strongly broadened, with apical lobe; hind tibia with ventral carina on the ventral part extending to half the length of the tibia; base of tarsal claws with strong tooth.

Forewing (Fig. 15b) hyaline; 1.1× as long as body, pubescent, with cilia on margins; radial cell opened, around 2.6× as long as broad; veins light brown; areolet present. Rs+M vein obsolete heading towards the middle of the basal vein.

Metasoma (Fig. 15d) shorter than head+mesosoma, longer than high. 2nd metasomal tergum occupying 3/4 parts on the metasoma, with lateral patch of white setae, without micropunctures or micropunctures obsolete, all subsequent terga uniformly and entirely smooth or with obsolete micropunctures. Prominent part of ventral spine of hypopygium spine-like, around 2.6× as long as broad, with sparse setae laterally, without apical tuft of setae. Body length: 2.9 mm (^{Weld, 1944}).

Gall (Fig. 15c). Globular, bud gall up to 8.4 mm in diameter, more or less with short bracts usually on apical half. The internal parenchyma is cavernous with numerous lamellae connecting the outer shell and the larval chamber.

Taxonomic summary

Type material examined. Holotype asexual female deposited in the USNM with the following labels: “Young. Ariz” (white label), “Type. No. 56377, U.S.N.M.” (red label), “Andricus bracteatus 1942 Weld” (white label), “USNMENT 00779931” (white label with a QR code). Holotype examined through the images available at the website of the Entomology Department in the USNM: http://n2t.net/ark:/65665/3e449c73d-2c5a-49ee-8f2b-94f3ac9f237c

Biology. Only the asexual generation is known. The holotype was collected from an unknown Quercus, but the paratypes are reported as inducing galls on Q. oblongifolia Torr. and Q. rugosa (= diversicolor Trel.) According to ^{Weld (1944)} similar galls are also reported in Q. arizonica Sarg., and Q. toumeyi Sarg. (section Quercus, subsection Leucomexicanae, white oaks). The galls were collected between December and February, and the adults emerge in late March (^{Weld, 1944}).

Distribution. USA: Arizona (^{Weld, 1944}).

Femuros ocri Kinsey, 1937

Figs. 16a-e, 17a-d

Femuros ocri Kinsey, 1937; in ^{Kinsey, 1937b: 470-471}, female, gall; ^{Pujade-Villar & Ferrer-Suay, 2015: 8}. Andricus ocri (Kinsey): ^{Weld, 1952: 307}.

Diagnosis. Differs from F. repandae by the POL 2.0× as long as OOL, OOL similar in length to the diameter of lateral ocellus, height of eye 2.5× as long as malar space, and the transfacial distance subequal to the height of the eye. Differs from F. ruidum by the sparsely pubescent mesopleuron, which is smooth, with scattered piliferous points, the speculum smooth and glabrous at least on half of its length, and the propodeal carinae are parallel.

Redescription. Asexual female (Figs. 16a-e, 17a-c). Head, mesosoma, metasoma and legs reddish-brown (with some darker areas in anterior parallel lines and parasidal lines); antenna light brown, parallel flagellomere darker; tegula yellowish. Wing veins brown.

Head (Fig. 16a-c) transversally ovate, broadest part below toruli, broader than high and narrower than mesosoma in frontal view, with short dense white setae; 1.3× as broad as high in anterior view and head 2.0× as broad as long in dorsal view. Gena alutaceous to smooth, slightly broadened behind eye, as broad as cross diameter of eye, measuring along transfacial line. Malar space weak alutaceous, without striae radiating from clypeus, malar sulcus absent; eye 2.1× as high as length of malar space. Inner margins of eyes parallel. POL 2.6× as long as OOL, OOL as long as diameter of lateral ocellus and as long as LOI, all ocelli rounded, of same size. Transfacial distance 1.1× as long as height of eye; toruli located above mid height of head; frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye slightly longer than diameter of torulus. Lower face almost smooth raised central part below the toruli alutaceous, pubescent. Clypeus impressed, coriaceous, rounded ventrally, medially not incised, anterior tentorial pits distinct; epistomal sulcus and clypeo-pleurostomal line distinctly impressed. Frons uniformly coriaceous, without striae, with few setae, piliferous points visible; interocellar area coriaceous with piliferous points; space between lateral ocellus to compound eye almost smooth and shining. Vertex and occiput coriaceous. Antenna (Fig. 16d) shorter than length of head + mesosoma, with 11 flagellomeres; pedicel 1.5× longer than broad; flagellomeres not broadening until apical end; F1 1.2× as long as F2 and 3.6× as long as pedicel; subsequent flagellomeres progressively shortened; F3 = F4, F5 = F6, F7 to F10 equal in length F11 longer than F10, sometimes F11 with a very inconspicuous suture and thus antenna with 12 flagellomeres. Placodeal sensilla on F5-F11.

Mesosoma (Figs. 16e, 17a-c) 1.2× as long as high, concave in lateral view, pubescent. Sides of pronotum alutaceous, with white setae and weak, parallel carinae in upper lateroposterior part, anterolateral rim of pronotum inconspicuous. Mesoscutum 1.2× as broad as long in dorsal view; weak coriaceous, without rugae, pubescent, with piliferous points more visible in the posterior half between notauli. Notaulus complete, deep, straight, converging posteriorly, in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; median mesoscutal line present; parapsidal lines and anterior parallel lines differentiated by alutaceous sculpture. circumscutellar carina absent. Mesoscutellum as long as broad, uniformly rugose; overhanging metanotum, with sparse long setae. Mesoscutellar foveae differentiated, delimited posteriorly by a weak carina, triangular, deep, with weak alutaceous to smooth bottom, separated by a median carina. Mesopleuron sculptured, coriaceous to weak reticulate with delicate carinae and sparse setae anteriorly, speculum smooth and shining; mesopleural triangle alutaceous, with dense white setae, hiding the surface sculpture; dorsal and lateral axillar areas with delicate parallel longitudinal carinae, glabrous; axillula alutaceous, pubescent; subaxillular bar smooth, glabrous, triangular, posteriorly as high slightly shorter than high of metanotal trough; metapleural sulcus reaching mesopleuron in upper 1/2 of its height; upper part of sulcus distinct; lower part of sulcus delimiting big area with dense long white setae. Metascutellum subrectangular, coriaceous with some weak longitudinal carina, curved ventrally; metanotal trough alutaceous, with dense setae; ventral bar of metanotal trough coriaceous dorsally and smooth ventrally; central propodeal area nearly smooth and glabrous; lateral propodeal carinae parallel by converging toward posterior end; lateral parts of propodeum uniformly alutaceous, densely pubescent. Nucha almost smooth and shining dorsally, with parallel sulci laterally. Legs (Fig. 16e) with hind coxa broad, hind femur strongly broadened, with apical lobe; hind tibia with ventral carina on the ventral part extending to half the length of the tibia; base of tarsal claws with strong tooth.

Forewing hyaline, 1.1× as long as body, pubescent, with cilia on margins; radial cell opened, around 2.6× as long as broad; veins light brown; areolet present. Rs+M vein obsolete heading towards the middle of the basal vein.

Metasoma (Fig. 16e) shorter than head+mesosoma, longer than high. 2nd metasomal tergum occupying 3/4 of metasoma, with lateral patch of white setae, without or with obsolete micropunctures, all subsequent terga uniformly and entirely smooth or with obsolete micropunctures. Prominent part of ventral spine of hypopygium needle-like, around 3.5-4.0× as long as broad, with sparse setae laterally, without apical tuft of setae. Body length: 3.0-4.5 mm (^{Kinsey, 1937b}).

Gall (Fig. 17d). Similar to F. repandae but smaller, diameter up to 12 mm.

Taxonomic summary

Type material examined. Holotype: female, deposited in the AMNH “Pabellon, 20W, Ags 7000, Mex; gall 11.26.31, female Spr. ‘32”, “Q. sacame Kinsey Coll.” (white labels), “F. ocri HoloParatype” (red label), “AMNH_IZC 00267206” (white label with a QR code). Paratypes (4 females): 3 females with same data as holotype (AMNH); 1 female, “Sayula, 13S W, Jal 7700’, Mex, gall 12.21.31, female 2.10.32”, “Q. rhodophleb Kinsey Coll.”, “F. ocri Kinsey coll 37” (white labels), “F. ocri paratype, in type box” (red label), (JP-V col.).

Additional material examined. Three females, deposited in the AMNH “Sayula, 13S W, Jal 7700’, Mex. _⊕, gall 12.21.31, female 2.10.32”, “Q. rhodophleb Kinsey Coll.”, “F. ocri Kinsey coll 37”; 1 female “Guadalajara,

Jal., 25W, 6000’, Mex. _⊕, 12.23.31, “Q. haematophleb Kinsey coll.”, “F. ocri Kinsey coll 37” white labels. New material deposited in the JP-V col. (UB): 11 asexual females: 3 females “Santa Fe, Delegación de Cuajimalpa, Ciudad de México, México, (MEX181), Ex Q. laeta, (28.ii.2014) iii.2014: 3 females, D. Cibrián-Tovar leg.; 3 females “Fracción de Bosques de Santa Fe, Delegación de Cuajimalpa, Ciudad de México, México, (MEX336), Ex Q. laeta, (10.xii.2015) 15-24.ii.2016: 3 females, D. Cibrián-Tovar”; 1 female “Nativitas, Texcoco, Estado de México, (MEX400), Ex Quercus sp., (13.i.2015) 19.i.2015: 1 female, A. Equihua-Martínez & E. Estrada-Venegas leg.”; 1 female “Nativitas, Texcoco, Estado de México, (MEX401), Ex Quercus sp., (13.i.2015) 19.i.2015: 1 female, A. Equihua-Martínez & E. Estrada-Venegas leg.”; 3 females “Peñón Blanco, 22°10’12.6” N, 102°31’14.8” W, San José de Grácia, Aguascalientes, México, (MEX645), Ex Q. grisea, (10.i.2021) 15.ii.21-20.iii.21: 3 females, R. Clark leg.”, “Femuros ocri Kinsey, 1937, JP-V det. 2022”.

Biology. The asexual generation is only known to induce galls on Q. arizonica Sargent (= Q. sacame Trel.), Q. grisea Liebm., Q. laeta Liebm., Q. magnoliifolia Née (=Q. haemathophlebiaTrel.), and Q. rugosa Née (= Q. rhodophlebia Trel.) (section Quercus, subsection Leucomexicanae, white oaks). The galls were collected between November and January; adults emerge between January and March (^{Kinsey, 1937b}). Distribution. México: Aguascalientes and Jalisco (^{Kinsey, 1937b}).

Femuros repandae Kinsey, 1937

Figs. 18a-f, 19a-d, 20a-c

Femuros repandaeKinsey, 1937; in ^{Kinsey, 1937a: 66-67}, female, gall; ^{Pujade-Villar & Ferrer-Suay, 2015:} 8. Andricus repandae (Kinsey): ^{Weld, 1952: 309}.

Diagnosis. Femuros repandaeis most closely related to F. bracteatus and both differ from F. ruidum and F. ocri by the POL which is around 1.5× as long as OOL, OOL 1.5× as long as diameter of lateral ocellus, the height of eye is 2.0× as long as the malar space, and the transfacial distance 1.3× as long as the height of the eye.Femuros repandaediffers fromF. bracteatusby the mesoscutum with the anterior parallel lines and parapsidal lines darkened, chestnut colored; mesoscutellar foveae divided by a thin and sharp carina, while inF. bracteatusthe anterior parallel lines and parapsidal lines are of the same color as the rest of the mesoscutum; and the mesoscutellar foveae are divided by a wide rugose elevated area.

Redescription. Asexual female (Figs. 18a-f, 19a-d, 20a-b). Head, mesosoma, metasoma and legs reddish-brown (with some darker areas in anterior parallel lines and parapsidal lines); antenna light brown, last flagellomere darker; tegula yellowish. Wing veins brown.

Head (Fig. 18a-d) transversally ovate, broadest part below toruli, broader than high and narrower than mesosoma in frontal view, with short dense white setae; 1.3× as broad as high in anterior view and head 2.0× as broad as long in dorsal view. Gena alutaceous to smooth, slightly broadened behind eye, as broad as cross diameter of eye, measuring along transfacial line. Malar space weak alutaceous, without striae radiating from clypeus, malar sulcus absent; eye 2.1× as high as length of malar space. Inner margins of eyes parallel. POL 2.6× as long as OOL, OOL as long as diameter of lateral ocellus and as long as LOL, all ocelli rounded, of same size. Transfacial distance 1.1× as long as height of eye; toruli located above mid height of head, frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye slightly longer than diameter of torulus. Lower face almost smooth raised central part below the toruli alutaceous, pubescent. Clypeus impressed, coriaceous, rounded ventrally, medially not incised, anterior tentorial pits distinct; epistomal sulcus and clypeo-pleurostomal line distinctly impressed. Frons uniformly coriaceous, without striae, with few setae, piliferous points visible; interocellar area coriaceous with piliferous points; space between lateral ocellus to compound eye almost smooth and shining. Vertex and occiput coriaceous; postocciput and postgena glabrous, alutaceous-reticulate, with concentric lines around occipital foramen and postgenal bridge; posterior tentorial pit large, elongated, area below impressed; occipital foramen as high as height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci which strongly diverge toward occipital foramen, postgenal bridge anteriorly slightly broader than occipital foramen. Antenna (Fig. 18e) shorter than length of head + mesosoma, with 11 flagellomeres; pedicel 1.5× longer than broad; flagellomeres not broadening until apical end; F1 1.2× as long as F2 and 3.6× as long as pedicel; subsequent flagellomeres progressively shortened; F3 = F4, F5 = F6, F7 to F10 equal in length F11 longer than F10, sometimes F11 with a very inconspicuous suture and thus antenna with 12 flagellomeres. Placodeal sensilla on F5-F11.

Mesosoma (Figs. 18f, 19a-d) 1.2× as long as high, concave in lateral view, pubescent. Sides of pronotum alutaceous, with white setae and weak and parallel carinae in upper lateroposterior part, anterolateral rim of pronotum inconspicuous. Mesoscutum 1.2× as broad as long in dorsal view; weak coriaceous, without rugae, pubescent, with piliferous points more visible in the posterior half between notauli. Notauli complete, deep, straight, converging posteriorly, in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; median mesoscutal line present; parapsidal lines and anterior parallel lines differentiated by alutaceous sculpture. Circumscutellar carina absent. Mesoscutellum as long as broad, uniformly rugose; overhanging metanotum, with sparse long setae. Mesoscutellar foveae differentiated, delimited posteriorly by a weak carinae, triangular, deep, with weak alutaceous to smooth bottom, separated by a median carina. Mesopleuron completely sculptured, coriaceous to weak reticulate with delicate carinae and sparse setae anteriorly, speculum smooth and shining; mesopleural triangle alutaceous, with dense white setae, hiding the surface sculpture; dorsal and lateral axillar areas with delicate parallel longitudinal carinae, glabrous; axillula alutaceous, pubescent; subaxillular bar smooth, glabrous, triangular, posteriorly as high slightly shorter than high of metanotal trough; metapleural sulcus reaching mesopleuron in upper 1/2 of its height; upper part of sulcus distinct; lower part of sulcus delimiting big area with dense long white setae. Metascutellum subrectangular, coriaceous with some weak longitudinal carina, curved ventrally; metanotal trough alutaceous, with dense setae; ventral bar of metanotal trough coriaceous dorsally and smooth ventrally; central propodeal area nearly smooth and glabrous; lateral propodeal carinae parallel by converging toward posterior end; lateral parts of propodeum uniformly alutaceous, densely pubescent. Nucha almost smooth and shining dorsally, with parallel sulci laterally. Legs with hind coxa broad, hind femur strongly broadened, with apical lobe; hind tibia with ventral carina on the ventral part extending to half the length of the tibia; base of tarsal claws with strong tooth.

Forewing (Fig. 20a) hyaline, 1.1× as long as body, pubescent, with cilia on margins; radial cell opened, around 2.6× as long as broad; veins light brown; areolet present. Rs+M vein obsolete heading towards the middle of the basal vein.

Metasoma (Fig. 20b) shorter than head+mesosoma, longer than high. 2nd metasomal tergum occupying 3/4 parts of metasoma length, with lateral patch of white setae, without or with obsolete micropunctures; all subsequent terga uniformly and entirely smooth or with obsolete micropunctures. Prominent part of ventral spine of hypopygium needle-like, around 3.5-4.0× as long as broad, with sparse setae laterally, without apical tuft of setae. Body length: 3.2-4.0 mm (^{Kinsey, 1937a}).

Gall (Fig. 20c). Bud gall, globular to spherical, unilocular, sessile, located on main or side twigs, solitary or occasionally in groups of 2 or 3 galls. It is normally spherical (diameter up to 17 mm), distorted by the bracts, deformed leaves, and petioles, which are fused on the surfaces. Green touched with red when young, silvery and purple-brown when mature (similar to the twig bark). In section, a hard wall is observed that surrounds the gall, a spongy-opened and lax tissue and a large spherical central larval chamber thick and hard walled, up to 7 mm in diameter even in small galls; the spongy tissue usually is darker in mature galls.

Taxonomic summary

Type material examined. Holotype asexual female deposited in the AMNH: “Mex. (City), 32E; D.F. 10,600; gall 1.3.32, 13 females, 4.24.32”; “Q. repanda, Kinsey Coll.”; red handwriting label “ Femuros repandae Holoparatype”; “AMNH_IZC 00267207” (white label with a QR code). Paratypes: 15 females with same data as holotype, except for 6 females with different emergence date “4.16.32” (13 females deposited in the AMNH, 2 paratype females deposited I the JP-V col., UB). Type material fromF. ruidumbelonging to F. repandae. Seven females deposited in the AMNH “Mex. _⊕, Cuernavaca 8N, Mor. 8700; gall 1.7.32, 1 female, 4.10.32”; “Q. texcocana, Kinsey Coll.”; red handwriting label “ Femuros ruidum Paratype”.

Additional material. Material deposited in JP-V col. (UB), 15 asexual females: 1 female “San Juan Coajomulco, 19º45’21.0” N, 99º59’06.4” W, Jocotitlan, Estado de México, México, (MEX254), Ex Q. martinezii, (16.x.2013) 10.vi.2014; 1f, D. García-Martiñón leg.”; 2 females “San Juan Coajomulco, 19º45’21.0” N, 99º59’06.4” W, Jocotitlan, Estado de México, México, (MEX255), Ex Q. rugosa, (22.ix.2013) 30.iii.2014: 1f, D. García-Martiñón leg.”; 4 females “San Juan Coajomulco, 19º45’21.0” N, 99º59’06.4” W, Jocotitlan, Estado de México, México, (MEX256), ExQ. obtusata, (18.i.2014) 28.i-5.iii.2014: 1f, D. García-Martiñón leg.”; 3 females “La Cumbre, 17º10’01” N, 96º35’58” W, Santa Catarina Ixteteji, Oaxaca, México, (MEX649), Ex Q. rugosa, (02.ii.2020) 10. vi.2020: 3 females, R. Clark leg.”; 3 females “Santa María Yavesía, 17º16’04.8” N, 96º26’06.5” W, Santa María Yavesía, Oaxaca, México, (MEX650), Ex Q. crassifolia, (20.i.2022) 20.iii-20.iv.2022: 3 females, R. Clark leg”; 2 females “La Congoja, 22º09’34.5” N 102º33’05.2” W, San José de Grácia, Aguascalientes, México, (MEX651), Ex Q. grisea, (12.xii.2021) 15.ii-03.iii.2022: 2 females, R. Clark leg.”.

Biology. The asexual generation is only known for inducing galls onQ. deserticolaTrel. ( = texcocana Trel.), Q. grisea Liebm.,Q. martinezii C.H. Muller, Q. obtusata Bonpl., Q. repanda Bonpl., Q. rugosaNée (sectionQuercus, subsection Leucomexicanae, white oaks), and 1 oak species from section Lobatae, Q. crassifolia Bonpl.. The adult galls were collected between September and February; adults emerge between January and April (^{Kinsey 1937a}). Distribution. México: México City (^{Kinsey 1937a}).

Femuros ruidum Kinsey, 1937

Figs. 21a-f, 22a-d, 23a-c

Femuros ruidumKinsey, 1937; in ^{Kinsey, 1937a: 67-68}, female, gall; ^{Pujade-Villar & Ferrer-Suay, 2015: 8}.

Andricus ruidus(Kinsey): ^{Weld, 1952: 309}.

Diagnosis. Femuros ruidum differs from F. repandae by having the POL 2.0× as long as OOL, the OOL is equal to length of lateral ocellus, the malar space 0.4× as long as height of the eye; the transfacial distance subequal to the height of the eye. Differs from F. ocri by the densely pubescent and distinctly punctured mesopleuron; the speculum pubescent and punctured except for a small smooth central area; propodeal carinae bent outwards.

Redescription. Asexual female (Figs. 21a-f, 22a-d, 23a-b). Head, mesosoma, metasoma and legs reddish- brown (without darker areas); antenna light brown, last flagellomere darker; tegula yellowish. Wing veins brown.

Head (Fig. 21a-e) transversally ovate, broadest part below toruli, broader than high and narrower than mesosoma in frontal view, with short dense white setae; 1.3× as broad as high in anterior view and head 2.4× as broad as long in dorsal view. Gena alutaceous, slightly broadened behind eye, as broad as cross diameter of eye, measuring along transfacial line. Malar space weak alutaceous to smooth, without striae radiating from clypeus, malar sulcus absent; eye 2.1× as high as length of malar space. Inner margins of eyes parallel. POL 1.6× as long as OOL, OOL 2.6× as long as diameter of lateral ocellus and longer than LOL, all ocelli rounded, of same size. Transfacial distance 1.2× as long as height of eye; toruli located above mid height of head, frons shorter than height of lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye slightly longer than diameter of torulus. Lower face alutaceous to weak coriaceous, raised central part below the toruli coriaceous, pubescent. Clypeus impressed, coriaceous, rounded ventrally, medially not incised, anterior tentorial pits distinct; epistomal sulcus and clypeo-pleurostomal line distinctly impressed. Frons uniformly coriaceous, without striae, with few setae, piliferous points visible; interocellar area coriaceous with piliferous points; space between lateral ocellus to compound eye almost smooth and shining. Vertex and occiput coriaceous. Antenna (Fig. 21f) shorter than length of head + mesosoma, with 11 flagellomeres; pedicel 1.5× longer than broad; flagellomeres from F5 broadening until apical end; F1 1.4× as long as F2 and 4.1× as long as pedicel; subsequent flagellomeres progressively shortened; F11 longer than F10, sometimes F11 with a very inconspicuous suture and thus antenna with 12 flagellomeres. Placodeal sensilla on F5-F11.

Mesosoma (Figs. 21d, 22a-d) 1.2× as long as high, pubescent, concave in lateral view. Sides of pronotum alutaceous, with white setae and inconspicuous carinae in upper lateroposterior part, anterolateral rim of pronotum inconspicuous. Mesoscutum 1.1× as broad as long in dorsal view; weak coriaceous, without rugae, pubescent, with piliferous points more visible in the posterior half between notauli. Notauli complete, deep, straight, converging posteriorly, in most posterior part distance between notauli shorter than distance between notaulus and side of mesoscutum; median mesoscutal line absent; parapsidal lines and anterior parallel lines differentiated by alutaceous sculpture, almost smooth. Circumscutellar carina absent. Mesoscutellum slightly longer than broad, uniformly rugose; overhanging metanotum, with sparse long setae. Mesoscutellar foveae differentiated, triangular, relatively deep, not defined posteriorly with alutaceous bottom, separated by a median carina. Mesopleuron alutaceous to smooth, pubescent with piliferous points, speculum smooth and shining; mesopleural triangle alutaceous, with dense white setae, hiding the surface sculpture; dorsal and lateral axillar areas with delicate parallel longitudinal carinae, glabrous; axillula alutaceous, pubescent; subaxillular bar smooth, glabrous, triangular, posteriorly as high slightly shorter than high of metanotal trough; metapleural sulcus reaching mesopleuron in upper 1/2 of its height; upper part of sulcus distinct; lower part of sulcus delimiting big area with dense long white setae. Metascutellum subrectangular, coriaceous with some weak longitudinal carina, curved ventrally; metanotal trough alutaceous, with dense setae; ventral bar of metanotal trough coriaceous; central propodeal area nearly alutaceous with some rugae and glabrous; lateral propodeal carinae parallel by converging toward posterior end; lateral parts of propodeum uniformly alutaceous to smooth, densely pubescent. Nucha almost smooth and shining dorsally, with parallel sulci laterally. Legs (Fig. 23b) with hind coxa broad, hind femur strongly broadened, with apical lobe; hind tibia with ventral carina on the ventral part extending to 4/5 the length of the tibia; base of tarsal claws with strong tooth.

Forewing (Fig. 23a) hyaline, 1.1× as long as body, pubescent, with cilia on margins; radial cell opened, around 2.6× as long as broad; veins light brown; areolet present. Rs+M vein obsolete heading towards the middle of the basal vein.

Metasoma (Fig. 23b) shorter than head+mesosoma, slightly longer than high. Metasomal tergite 2 occupying 2/3 parts of the metasoma, with lateral patch of white setae, without micropunctures or micropunctures obsolete, all subsequent tergites uniformly and entirely smooth or with obsolete micropunctures. Prominent part of ventral spine of hypopygium needle-like, around 5.5× as long as broad, with sparse setae laterally, without apical tuft of setae. Body length: 3.0-4.3 mm (^{Kinsey, 1937a}).

Gall. (Fig. 23c). Similar to F. repandae but larger, diameter up to 23 mm.

Taxonomic summary

Type material of F. ruidum. Holotype asexual female: “Mex. _⊕, Cuernavaca 8N, Mor. 8700; gall 1.7.32, 8 females, 3.5.32”; “Q. texcocana, Kinsey Coll.”; red handwriting label “ Femuros ruidum Holoparatype”; (deposited in AMNH, AMNH_IZC 00267208). Paratypes: 3 females and 3 galls “Mex. _⊕, Cuernavaca 8N, Mor. 8700; gall 1.7.32, 1 female, 4.10.32”; “ Q. texcocana , Kinsey Coll.”; red handwriting label “ Femuros ruidum Paratype” (1 female in AMNH; 1 female in JP-V col; 1 female and galls in HMNH); 3 females “Mex (City) 12W, D.F. 8500”; “Mex. _⊕, gall 1.13.32, 10 females, 4.10.32”; “Q. texcocana, Kinsey Coll.”; “Femuros ruidum Kinsey coll.” (1 female in JP-V col; 2 females in HMNH). Type material of F. repandae belonging to F. ruidum. Paratypes: 1 female “Mex. (City) 32E, D.F. 10600; gall 1.3.32, 9 females, 4.16.32”; “Q. repanda, Kinsey Coll.”; red handwriting label “Femuros repandae Paratype” (deposited in JP-V col).

Additional material. Seven asexual females deposited in the JP-V col. (UB) with the label “Universidad de la Sierra Juárez, 17º18’54” N, 96º28’58” W, Ixtlán de Juárez, Oaxaca, México, (MEX646-648), Ex Q. glaucoides, R. Clark leg.” and different collection and emergence dates: 1 female (“10.II.2018) 27.IV.2018”; 3 females (“08.XII.2020) 10.i- 20.ii.2021”; and 3 females (“10.XII.2018) 10.i.2019”.

Biology. The asexual generation is only known to induce galls on Q. deserticola (= texcocana Trel.) and Q. rugosaNée (= conglomerata Trel. = rhodophlebia Trel.), according to ^{Kinsey (1937a)}; and Q. glaucoides Mart. & Gal. (section Quercus, subsection Leucomexicanae, white oaks) in this study. The galls were collected between December and March, and the adults emerge between January and April.

Distribution. México: México City, Morelos, and Oaxaca (^{Kinsey, 1937a}).