Appendix, Specimens examined.

Xenosaurus agrenon: Mexico: Oaxaca: Río Sal, Lachao, Juquila (UIMNH 69375 [holotype], 69373-74, 69376 [paratypes]; UCM 41821, 4447578); 1 km N Río Sal (MZFC 9541-44); 2 km E Río Sal (MZFC 9545).

Xenosaurus arboreus: Mexico: Oaxaca: North Zanatepec (UCM 39889); the summit of the Sierra Madre, above Zanatepec (UIMNH 56576, holotype); the summit of the Sierra Madre, near Zanatepec (UIMNH 56158, paratype); Sierra Madre, N of Zanatepec (UIMNH 56577-78, paratypes).

Xenosaurus grandis: Mexico: Veracruz: Cuautlapan (MZFC 5920 [3 specimens], 6889-91, 6895-98, 9510); on road from Cuautlapan to Orizaba (MZFC 6892-94).

Xenosaurus mendozai: Mexico: Querétaro: Municipality of Landa de Matamoros: Acatitlán de Zaragoza (MZFC 5367 [2 specimens], 6285); 5.5 km NNE of Tilaco (MZFC 8475-79); Tilaco (MZFC 27387-90); km 10 on road Lagunilla-Tilaco (MZFC 1488-89, 8004); Cerro La Cañada, approximately 3 km on road Tilaco-Santa Inés (MZFC 8005, 27385-86); approximately 7 km NE of Tilaco (MZFC 9422, 9440-44, 11396-97).

Xenosaurus newmanorum: Mexico: San Luis Potosí: Xilitla (MZFC 5928 [2 specimens], 10135); about 7.2 km NE Xilitla (MZFC 7484); about 5 km N Xilitla, km 268 on road from Xilitla to Tamazunchale (MZFC 8451-55); km 7.2 on road from Xilitla to Tamazunchale (MZFC 6521). No specific locality (MZFC 3476).

Xenosaurus penai: Mexico: Guerrero: Cerro Pico del Aguila (16°57' N, 98°19' W), Sierra de Malinaltepec (IBH 6414, holotype); foothills on E face Cerro Pico del Aguila (MZFC 7099, paratype); on road from El Terrero to Cerro Pico del Aguila (an adult female [MZFC 8479] and its litter [MZFC 7485-87, 8456]; paratypes).

Xenosaurus phalaroanthereon: Mexico: Oaxaca: Sierra Madre del Sur, Municipality of Santa María Ecatepec; about 4 km NE San Juan Acaltepec (MZFC 7093-95, 7097-98; UTACV R-46031-32; paratypes); about 6.1 km SW San Juan Acaltepec (16°14.93' N, 95°57.29' W), 2005 m (MZFC 12223-24 [paratypes], 12225 [holotype], 12226, 12228-31 [paratypes]; UTACV R-46033 [paratype]).

Xenosaurus platyceps: Mexico: Tamaulipas: km 25 on road from Jaumave to Ciudad Victoria (MZFC 5524 [2 specimens], 5543); about 1.1 km NE from turnoff (sic), on old road to Rancho El Cielo (MZFC 8517); 3 km SE Estación Canindo, Reserva de la Biósfera Rancho El Cielo (MZFC 8518); on road from Gómez Farías to Ejido Azteca (MZFC 8519-21); 18.9 km SW Ciudad Victoria (MZFC 9557-60); 21.7 km W Ciudad Victoria, on Mexico Hwy 101 on road to Jaumave (MZFC 10051).

Xenosaurus rackhami rackhami: Guatemala: Alta Verapaz: Finca El Volcán (UTACV R 24844-45); Mexico: Chiapas: Selvas El Ocote (ECOSC-H 34, 100; MZFC 6886-87); km 23 on road from Ocozocoautla to Apic Pac (MZFC 6888); Predio Filadelfia, km 21.7 on road from Ocozocoautla to Apic Pac (MZFC 9552-56); NW Cintalapa (UTACV R 31031, 31066); Cerro del Sumidero, 10.7 mi N Tuxtla Gutiérrez (UCM 19028).

Xenosaurus rackhami sanmartinensis: Mexico: Veracruz: Los Tuxtlas (MZFC 4683); Los Tuxtlas, Sierra de Santa Martha (MZFC 6100); El Ariete-Barrava, Bastonal, Sierra de Santa Martha (UNAM-LT 2712-13); Bastonal, Sierra de Santa Martha (MZFC 9564, UNAM-LT 2794); La Asociación, Sierra de Santa Martha (UNAM-LT 2714, 2716); Azufrera, Sierra de Santa Martha (UNAM-LT 2715); crater of Volcán San Martín (MZFC 10553-54); Volcán San Martín (MZFC 9563, 9565; UTA R-29979, 36582, UNAM-LT 2767).

Xenosaurus rectocollaris: Mexico: Puebla: 5 km NE Azumbilla, 28 air km NNE Tehuacán (MZFC 113); 9 km E Chapulco (MZFC 5719 [3 specimens]); 8 km E Chapulco (MZFC 5923 [2 specimens], 5924, 7554, 9511-12); about km 10 on road from Tehuacán to Orizaba (MZFC 10046).

Xenosaurus tzacualtipantecus: Mexico: Hidalgo: La Mojonera (MZFC 6284, 9513-17, 10136-37).