1916 ] Camp: Amphibians and Reptiles 523 



size of scales on side of neck, and coloration, but fall easily within the 

 general range of characters given for this species. The femoral pores 

 are much enlarged in the males and almost indistinguishable in the 

 female, a condition holding in many other species of lizards of the 

 locality in the early summer season when collecting was done. The 

 femoral pores number 15 in one thigh, 16 in three, 17 in one, 18 in 

 three, 20 in two, 23 in one, and 24 in one of the thighs, where counts 

 could be made; being J* 23 right: 24 left, ^20:20, ^18:19, ^18:16, 

 J 1 — :18, J 1 16:17, S 15:16, ? — :— . One individual exhibits an ac- 

 cessory row of pores on each side. 



Some of the specimens show a great amount of red on both dorsal 

 and ventral surfaces and a few do not ; some are banded on the tail 

 and some exhibit scarcely a trace of this characteristic. In a young 

 specimen there are around the tail four broad, encircling bands of 

 brown alternating with three circles of yellow. An adult male (no. 

 5520) is colored as follows: top of head dark brown, nearly black, 

 with many yellow scales scattered over the occiput and head and small 

 patches of orange in the ear just behind the tympanum ; back speckled 

 with black scales in lichen-like pattern; about an equal number of 

 orange and of yellow scales, evenly dispersed, covering most of back ; 

 shoulder patches large, dark brown, and dorsal surfaces of limbs dark 

 brown ; feet spotted with yellow ; head and limbs beneath, black ; belly 

 almost uniform dark morocco to brick red ; tail abruptly lighter than 

 rest of body, deep colonial buff, faintly banded with three broad rings 

 of deep olive buff. The measurements of the largest male are : total 

 length 371 millimeters, tail length 198 millimeters. 



This clumsy, vegetarian lizard is common on the rocky slopes of 

 the Turtle Mountains and may occasionally be seen in the patches of 

 scoriae out from the base of the range. It was never noticed else- 

 where, and having rather feeble powers of locomotion, doubtless de- 

 pends upon the security of the rocks to a greater extent than do swifter 

 lizards. It lacks the curiosity of smaller species and loses no time in 

 slipping to safety at the approach of danger. 



Chuckwallas were seen perching on rocks so hot as to be unbear- 

 able to the hand, and big, gorgeously colored males were noted in pur- 

 suit of each other over hillsides in the middle of the hottest July days. 

 In the latter part of June one pair, male and female, were seen near 

 one another. 



The clmckwalla has a curious habit of sticking out the fleshy 

 tongue at every few steps when walking along. Like toads and 



