1!, "'l Camp: Amphibians and Reptiles 521 



Some of the females taken in July contained eggs. Two eggs, 18 

 by 9 millimeters in the two diameters, were taken from one lizard; 

 these had coriaceous coverings and were apparently ready to be laid. 



Crotaphytus collaris baileyi Stejneger 

 Bailey Collared Lizard 



Eight specimens (nos. 5480-5487) represent this form in the col- 

 lection from the Turtle Mountain region. There are five males and 

 three females, the former being readily distinguished by the large 

 postanal plates. All have the interorbital scales in two distinct rows. 



The femoral pores are 16 in three thighs, 17 in five, 19 in four, 20 

 in two and 21 in two ; being $ 21 right : 21 left once, $ 20 :20, J\ ? 19 : 19 

 twice. £ 17:17 twice, <? 16:17, and J 1 16:16. They are very small in 

 the three females, medium-sized in three males, and large in two of 

 the males. Stejneger (1890, p. 105) describes the color of a living 

 Bailey collared lizard from the San Francisco Mountain plateau, Ari- 

 zona. None of our specimens show strongly marked reticulations as 

 do examples from farther east and north. All the females have faint 

 indications of whitish cross-bars, and in them the black collar is not 

 joined below the neck. The males have the collar connected ventrally, 

 and the largest males show not a sign of dorsal cross-bars. The total 

 length of the largest specimen, a male, is 310 millimeters, the tail 

 length 214 millimeters. 



These grotesque lizards inhabit the rocky slopes of the Turtle 

 Mountains in numbers and live also among the rocks about the bases 

 of the hills, but they were never seen on the open desert. This agrees 

 with observations by Taylor (1912, p. 326) in northern Nevada. Like 

 the chuckwallas, the Bailey lizards mount rocky eminences and lie for 

 hours in the sun during the hottest part of the day. When approached 

 they slip down into crevices or run with alacrity over the roughest 

 ground, clearing obstacles up to two feet in height with great leaps. 

 The males distend their dark throats when "showing off." They seem 

 hard to kill, and when thought dead will sometimes "come to life" in 

 the collecting sack, blinking their yellow eyes and looking ferocious. 

 "When under excitement the brilliantly colored throat is distended and 

 the huge mouth is sometimes opened in anger. Coues (1875, pp. 598- 

 599) has recorded interesting observations upon the habits of this 

 species. 



One stomach contained two chewed grasshoppers, and another 

 three orthopterous insects, more or less chewed, and four small beetles. 



