90 BULLETIN 199, UNITED STATES NATIONAL MUSEUM 



to the "Colorado Desert" and here restricted to the vicinity of Yuma, 

 Ariz. 



Range. — Extreme southeastern Baja CaHfornia, southwestern 

 Arizona, and northeastern Baja Cahfornia; possibly occurs in Sonora. 

 Reported in Mexico only from Baja California. 



UMA NOTATA COWLESI Heifetz 



Uma notata cowlesi Heifetz, Copeia, 1941, pp. 104-106, fig. 5 (distribution). 



Type. — California Acad. Sci. No. 53370; J. E,. Slevin collector. 

 Type locality. — Shores of Tepoca Bay, Sonora. 

 Range. — The coast of northern Sonora, from Cerro Prieto to 

 Tepoca Bay. 



Genus PETROSAURUS Boulenger 



Petrosaurus Boulengek, Catalogue of the lizards in the British Museum, ed. 2, 

 1885, vol. 2, p. 205.— MiTTLEMAN, BuU. Mus. Comp. Zool., vol. 91, 1942, 

 pp. 110-111. 



Genotype. — Uta thalassina Cope. 



Range. — Southern Baja California and certain adjacent islands in 

 the Gulf of California. 

 Species. — Two. 



KEY TO SPECIES OF PETROSAURUS 



1. Two series of scales between subocular and labials; snout longer, less truncate; 

 three distinct anterior dorsal cross bars; throat yellow, orange, or pale blue 



centrally thalassina (p. 90) 



One series of scales between subocular and labials; snout shorter and more 

 truncate; four distinct anterior dark bands; throat brownish marked with 

 blackish centrally repens (p. 90) 



PETROSAURUS REPENS (Van Denburgh) 



Uta repens Van Denburgh, Proc. California Acad. Sci., ser. 2, vol. 5, 1895, p. 

 102, pis. 7, 8, figs, a-e; Occ. Pap. California Acad. Sci., No. 10, 1922, pp. 189- 

 191.— LiNSDALE, Univ. California Publ. ZooL, vol. 38, 1932, pp. 360-361. 



Petrosaurus repens, Mittleman, BuU. Mus. Comp. Zool., vol. 91, 1942, p. 111. 



Type.— California Acad. Sci. No. 633; W. E. Bryant collector. 

 Type locality. — Comondu, Baja California. 



Range. — The southern half of Baja California, exclusive of the 

 Cape region; Isla Danzante. 



PETROSAURUS THALASSINUS (Cope) 



Uta thalassina Cope, Proc. Acad. Nat. Sci. Philadelphia, 1863, p. 104. — Van 

 Denburgh, Occ. Pap. California Acad. Sci., No. 10, 1922, pp. 186-189. 



Petrosaurus thalassinus, Boulenger, Catalogue of the lizards in the British 

 Museum, ed. 2, vol. 2, 1885, p. 205. 



T?/pe.— U.S.N.M. No. 5302; John Xantus collector. 

 Type locality. — Cape San Lucas, Baja California. 



