192 CALIFORNIA ACADEMY OF SCIENCES. 



yellow. The lower surfaces are yellow or yellowish 

 white, marked with slate or black anteriorly and along 

 the tips of the gastrosteges, and often more or less tinted 

 posteriorly with delicate rose pink. 



Length to anus 803 - 910 



Length of tail 350 - 366 + 



Distribution. The California!! range of this racer 

 seems to be restricted to the dryer eastern portions of 

 the State, leaving the more western parts to B. laterale. 

 " It is much more widely distributed [than the Califor- 

 nian racer], as specimens have been taken in Idaho, 

 Utah, Nevada, Arizona, New Mexico, and Mexico, but 

 it does not seem to reach the coast, nor does it appear 

 in the Valley of California, except at two points. These 

 are Walker Basin and Shasta County, northern Califor- 

 nia, where [Shasta Co.] it probably enters by way of Pitt 

 River Valley."* Localities at which it has been taken 

 in California are Shasta County (Baird, Canoe Creek), 

 Inyo County (Argus Range, Coso Valley and Mountains, 

 Panamint Mountains), and Kern County (Walker 

 Basin); in Nevada, Carson City, arid Antelope Springs; 

 in Oregon, Snake River; and in Idaho, between Bliss 

 and the Snake River. 



Genus 34. ARIZONA. 



Arizona, KENN., U. S. Mex. Bound. Surv., II, 1859, Eept., p. 18 

 (type elegans). 



The body is long and slender, with tail of moderate 

 length. The neck is constricted somewhat, so that the 

 head is distinct. The snout is long, rounded, and but 

 little lower than the flat top of the head. The cephalic 

 plates are normal. The nasals rarely unite above 

 the nostril. One (or two) preocular, two (or one) 



* Stejneger, N. A. Fauna, No. 7, 1893, p. 210. 



