CHECKLIST OF REPTILES OF MEXICO 97 



Occipital and posterior temporal horns extending back an equal distance (or 

 very nearly so); femoral pores 14-14, confined to single row. 



orbiculare dugesii (p. 98) 



17. Fourth (or fifth) temporal horn (counting forward) sharply pointed and 



greatly exceeding fifth (or fourth) in length 18 



Fourth and fifth temporal horns blunt, of nearly equal size, or fifth slightly 

 larger 20 



18. Nasal opening large; distance between inner edges less than l^i times maxi- 



mum diameter of nostril cerroense (p. 103) 



Nasal opening moderate, the distance between inner edges more than 1% 

 diameters of nostril 19 



19. Postrictal spine absent or rudimentary, .coronatum coronatum (p. 102) 

 Postrictal spine present coronatum jamesi (p. 102) 



20. Frontal plates in adults smooth, convex coronatura blainvillii (p. 103) 



Frontal plates in adults rough, striated or rugose, and flat or peaked. 



coronatum. frontale (p. 103) 



PHRYNOSOMA ORBICULARE ORBICULARE " (Linnaeus) 



[Tapayaxin, Lacertus orbicularis Hernandez, Plantas y animales de la Nueva 

 Espana, etc., 1651, C. xvi, p. 327, fig. (unnumbered).] 



Lacerta orbicularis Linnaeus, Systema naturae, ed. 12, vol. 1, 1789, p. 1062 (part, 

 based on Hernd,ndez). 



Agama orbiculaire, Cuvier, Regne animal, vol. 2, 1817, p. 35. 



Phrynosoma orbiculare, Wiegmann, Isis von Oken, 1828, p. 367. 



Phrynosoma orbiculare orbiculare, Smith, Trans. Kansas Acad. Sci., vol. 37, 1934, 

 p. 290, pi. 11, fig. 2, pi. 12, fig. 5. 



Phrynosoma wiegmanni Gray, The zoology of Captain Beechey's voyage . . ., 

 1839, p. 96 (type unknown; type locality, "Mexico," here restricted to 

 Mexico City, Distrito Federal). 



Tapaya orbicularis longicaudatus Duges, La Naturaleza, ser. 2, vol. 1, 1888, p. 117 

 (Alf. Duges Mus., Guanajuato, Guanajuato; Valley of Mexico, here re- 

 stricted to Mexico, D. F.). — Smith and Necker, Anal. Esc. Nac. Cienc. 

 Biol., vol. 3, 1943, pp. 216-218, pi. 2, figs. 1, 3. 



Type. — Presumably the unnumbered figure in Hernandez, loc. cit. 



Type locality. — Mexico (by inference), here restricted to Mexico, 

 D. F. 



Range. — The central plateau of Mexico from Chihuahua and 

 Nuevo Le6n southward to Michoacan, Morelos, and Puebla. Re- 

 ported from Mexico: Toluca, Lerma, San Andres, 11 miles south of 

 Mexico (city), Teotiliuacan, Zumpango; Puebla: Puebla, 15 kilo- 

 meters northwest of San Martin, Matamoros near Tezuitldn; Distrito 

 Federal: Mexico, Tlalpam, Rio San Juan de Dios, Tlalnepantla, 

 between Navitas and Chalco; Hidalgo: Guerrero near Real del 

 Mineral, Actopan, El Chico Parque Nacional, 2-3 miles west of 

 Tulancingo, near Paclmca; Morelos: near Tres Marias (Km. 57); 

 Chihuahua: south of Chihuahua City; Samachique, 21 mUes south 

 of Minaca; Durango: Coyotes, El Salto, Ciudad; Jalisco: North of 



w We are unable to agree to the idea of the conspecificity of the Mexican orbiculare group and the douglassil 

 group. We feel that among other important distinguishing characters the posterior indentation of the 

 skull, so marked in the latter group, has been overlooked in the pnst. 



