60 CALIFORNIA ACADEMY OF SCIENCES. 



stricted to the San Joaquin Valley, while the typical 

 G. wislizenii reaches the west slope of the Sierra Nevada 

 through Walker Pass, the summit of which is only 5,100 

 feet in altitude and, therefore, not above the vertical 

 range of the species." It probably lives in the Sacra- 

 mento Valley also, but has not been definitely recorded 

 from that region. 



Genus lo. SAUROMALUS. 



Sauromalus, Dumeril, Arch. Mus. d'Hist. Nat., VIII, 1856, i). 535, 

 (type ater); Euphryne., Baird, Proc. Ac. Nat. Sci. Phila., 1858, 

 p. 253 (type obesus) . 



The head and body are much depressed, and but little 

 shorter than the heavy conical tail. All of the head- 

 plates are small. The labials are juxtaposed. The ear- 

 opening is large, with a very strong anterior denticula- 

 tion. The dorsal scales are small and nearly uniform. 

 Long series of femoral pores and a strong transverse 

 gular fold are present. The lateral neck folds are 

 spinose. The superciliaries are juxtaposed. 



13. — Sauromalus ater Dumeril. Alderman Lizard. 

 Chuck-walla. 



Sauromalus ater, Dumeril, Arch. Mus. d'Hist. Nat., VIII, 1856, p. 



536, pi. XXIII, figs. 3, 3a (no locality). 

 Euphryne obesus, Baird, Proc. Acad. Nat. Sci. Phila., 1858, p. 253 



(type locality Fort Yuma, Cal.); Baird, U. S. Mex. Bouud. 



Surv., Kept. 1859, pi. XXVII. 



Description. — Head and body very large, much de- 

 pressed, the latter very broad. Head almost triangular, 

 with narrow rounded snout, and covered with small 

 plates largest on snout and temporal regions. Nostrils 

 opening upward, outward, and slightly backward, in 

 round plates a little nearer to end of snout than to 

 orbits. Superciliaries, like supraoculars, small and 

 juxtaposed. Suboculars all short, but strongly 



