CROCODILIANS, LIZARDS, AND SNAKES. 



579 



short distance into Ihe Upper Sonorau, aud consequently reaching some valleys in 

 which the former species is al)sent. In this respect it resembles the leopard lizard 

 {Crotaphytus wlzltzenH ), with which it is usually found. It lives on the open desert 

 and runs with great rapidity when alarmed. 



Ill California it is abundant in the Mohave Desert, where it ranges 

 westward through Antelope Valley to the Canada de las Uvas (changing 

 to subspecies undulatns), aud southward in the wash leading from near 

 Gorman station toward Peru Creek, in the Sierra Liebrc. In the open 

 cafion leading up to Tehachapi Valley froni the Mohave Desert it ranges 

 all the way to the summit of the pass (at Cameron) and probably 

 throughout Tehacha])i Valley also, but was not seen there because of a 

 severe cold wind, which lasted all day at the time we passed through. 

 It ranges up from the Mohave Desert over Walker Pass and down on 

 the west slope to the valley of Kern River, where it changes to sub- 

 species nndulatus. It is common in Owens Valley, and ranges thence 

 up on the warm, west slope of the Inyo and White Mountains to 2,130 

 meters (7,000 feet) or higher, opposite Big Pine; and is tolerably com- 

 mon also in Deep Spring Valley. It is common in Panamint, Death, 

 and Mesquite Valleys, ranging from the latter through Grapevine Canon 

 to Sarcobatus Flat. In Nevada it is common in the Amargosa, Pah- 

 rump, and Vegas Valleys, at the Bend of the Colorado, in the valleys 

 of the Virgin and Muddy, and reaches Oasis, Pahranagat, Desert, aud 

 Meadow Creek Valleys, and from the latter ranges up among the juni- 

 pers on the west slope of the Juniper Mountains, to an altitude of 1,980 

 meters (6,500 feet). In Utah it is common in the Lower Santa Clara 

 Valley, and thence ranges northward to the Upper Santa Clara Cross- 

 ing, but disappears before reaching Mountain Meadows. 



The food of Cneniidophorus tigris consists of grasshoppers and other 

 insects; no leaves or flowers were found in the numerous stomachs 

 examined. 



Hallowell in describing this subspecies as C. nndulatus recognized the 

 difference between it and the C. t. perplexus, remarking that the present 

 form has but two light stripes on each side. 



This form ranges the Sonoran region to Utah inclusive, and extends 

 to the northern part of California. 



Cnemidophorus tessellatus tessellatus Say. 



