CHECKLIST OF REPTILES OF MEXICO 139 



Range. — Southern Michoacan through Guerrero, Morelos, southern 

 Puebla to northern and western Oaxaca. Recorded only from the 

 states cited. 



SCELOPORUS PYROCEPHALUS Cope 



Sceloporris pyrocephalus Cope, Proc. Acad. Nat. Sci. Philadelphia, 1864, p. 177. — 

 Smith, Publ. Field Mus. Nat. Hist., zool. ser., vol. 26, 1939, pp. 368-373, 

 pis. 29, 30. 



Sceloporus pyrrhocephalus Cope, Proc. Ainer. Philos. Soc, vol. 22, 1885, pp. 

 394-397 (emendation). 



Type.—V.S.'N.M. No. 31495; John Xantus collector. 

 Type locality. — Near Colima, Colima. 



Range. — Central Jalisco, south and east through Colima and 

 Michoacan to Guerrero. Recorded only from states cited. 



SCELOPORUS NELSONI Cochran 



Sceloporus nelsoni Cochran, Journ. Washington Acad. Sci., vol. 13, 1923, pp. 

 185-186.— Smith, Publ. Field Mus. Nat. Hist., zool. ser., vol. 26, 1939, pp. 

 364-368, pi. 28. 



Type.— U.S. ISl.M. No. 47676; E. W. Nelson and E. A. Goldman 

 collectors. 



Type locality. — Plomosas, Sinaloa. 



Range — Pacific slopes from southwestern Chihuahua to northwestern 

 Jalisco. Recorded from Chihuahua, Sonora, Sinaloa, Nayarit, and 

 Jalisco. 



Genus SATOR Dickerson 



Sator Dickerson, Bull. Anaer. Mus. Nat. Hist., vol. 41, 1919, pp. 468-469. 



Genotype. — Sator grandaevus Dickerson. 



Range. — Santa Cruz and Cerralvo Islands in the Gulf of California. 



Species. — Two. 



KEY TO SPECIES OF SATOR 



1. A poorly defined anterior gular fold, without granules; a posterior (true) gular 

 fold immediately in front of arm insertions, but not continuous across throat; 

 median lateral scales very small, often granular, abruptly differentiated from 



dorsals and ventrals grandaevus (p. 140) 



A well defined anterior gular fold, with granules; no evidence whatever, even 

 at sides in front of arm insertions, of a posterior gular fold; median lateral 

 scales larger, gradually merging with dorsals and ventrals. axigustus (p. 139) 



SATOR ANGUSTUS Dickerson 



Sator nngustus Dickerson, Bull. Amer. Mus. Nat. Hist., vol. 41, 1919, p. 469. — 

 Schmidt, BuU. Amer. Mus. Nat. Hist., vol. 46, 1922, pp. 665-666, fig. 10.— 

 Van Denburgh, Occ. Pap. California Acad. Sci., No. 10, 1922, pp. 256-258. 



Type. — Amer. Mus. Nat. Hist. No. 5712; C. H. Townsend collector. 

 Type locality. — Santa Cruz Island, Gulf of California, Baja Cali- 

 fornia. 



Range. — Restricted to the type locality. 



861316 — 50 10 



