522 University of California Publications in Zoology [Vol. 12 



Crotaphytus wislizenii Baird and Girard 

 Leopard Lizard 



Six specimens of this species were secured (nos. 5488-5493) of 

 which two are females and four males, the latter with large postanal 

 scales. The femoral pores number 20 in one thigh, 22 in one, 23 in 

 three, 24 in four, and 25 in three; being <§ 25 right: 25 left once, $ 

 25 :23, $ 24 :24, J 1 , $ 23 :24 twice, J 1 20 :22. One of the females taken in 

 July still displays the red nuptial coloration : the bars on sides of 

 neck, back and hind legs (in ordinary coloration white or yellow) are 

 peach red to scarlet ; base and tip of tail beneath are shrimp pink. The 

 ground color of this individual is light neutral gray on the lighter 

 parts of the back ; fuscous spots occur on the back and sides, with 

 bands of the same color on the tail. A female (no. 5489) not exhibit- 

 ing red coloration contained one large egg. A large male has scarcely 

 a trace of the ordinary reticulation on the back, and the brown dorsal 

 spots are reduced to small dots on the body and tail. The longest 

 specimen, a male, has the following measurements : total length 364 

 millimeters, tail length 260 millimeters. 



The leopard lizard, probably the swiftest of North American desert 

 reptiles, was fairly common in the Turtle Mountain district at the 

 time I was there. This species does not inhabit the rocky hillsides in 

 that vicinity ; unlike the Bailey collared lizard, it appears to haunt 

 the more level plains and sandy places. Individuals are wary and 

 take to retreats, often before it is possible to get a shot at them. The 

 tracks of the hind feet of leopard lizards running swiftly in sand were 

 found to be ten inches apart. 



A grown gridiron-tailed lizard swallowed whole and head first was 

 found in one stomach. The flabby sides of the leopard lizard are often 

 distended with the remains of smaller lizards which they have run 

 down and swallowed. Taylor (1912, p. 348) and Franklin (1914) have 

 seen this species eat cicadas, leaping into the air to catch them. 



Sauromalus ater Dumeril 

 Chuckwalla 



Chuckwallas were common on the rocky sides of gulches at the 

 Horn Mine. Seven specimens were taken there, and one specimen in 

 a level field of scoriae at Blythe Junction. These specimens (nos. 

 5518-5525) show considerable individual variation in width of head, 



