CROTAPHYTUS 



121 



I am unable to find any difference between specimens 

 trom 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: 



Specimen from 



Length to anus 



Length of tail 



Snout to orbit 



Snout to ear 



Width of head 



Fore limb 



Hind limb 



Base of fifth to end of fourth toe 



Utah 



1 1 1 



121 



II 



27 



Cerros 



1 1 1 



123 

 II 

 28 

 20 

 40 

 79 

 30 



Cerros 



126 



262 

 13 

 31 



24 

 47 

 90 



34 



Arizona 



126 

 281 

 13 

 31 

 23 

 47 

 94 

 33 



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 



