6. CROTAPHYTUS 



121 



I am unable to find any difference between specimens 

 from Cerros and Magdalena islands, Lower California (C. 

 copei}, and those from the United States, either in colora- 

 tion or proportions. The following measurements show how 

 little difference there is: 



Distribution. The Leopard Lizard ranges from Texas 

 to California and from southern Idaho to Lower California 

 and Sonora. 



In California, it occupies almost the entire desert region 

 of the eastern part of the state, and has. been collected also 

 on the western slope of Riverside and San Diego counties. 

 Through Walker Pass, it reaches the western slope of the 

 Sierra Nevada, where it occurs in Kern Valley. It has been 

 collected in San Diego (Oak Grove, Campo), Imperial 

 (Fort Yuma, Hanlon Ranch, Salton Lake, Coyote Wells, 

 Colorado River opposite Cibola, Pilot Knob, New River), 

 Riverside (Riverside, San Jacinto, Hemet Valley, Snow 

 Creek, grass fields between Blythe and Mecca, Cottonwood 



