18. CNEMIDOPHORUS 511 



slightly larger than in C. /. stejnegeri. Eight longitudinal 

 rows of ventral plates. From three to six large scutes sur- 

 rounded by smaller plates and granules in front of anus. 

 Posterior surface of forearm covered with small, nearly 

 equal-sized granules. Tail very long and provided with 

 rings of large, obliquely keeled scales. Femoral pores 

 varying from 17 to 25. 



The color above is brownish, yellowish or bluish gray, 

 becoming paler toward the tail and darker on the sides, with 

 very irregular dark and light marblings. In young speci- 

 mens there are narrow light longitudinal lines separated by 

 darker bands which are more or less broken up by spots of 

 the same color as the lines. In older individuals these 

 lines have become more or less obscure, and in some the 

 upper surface is nearly unicolor. The upper surfaces of the 

 limbs are similarly colored. The dark markings on the 

 sides of the head and neck and on the gular region are small 

 and ill-defined. The tail is gray or brown, often with dark 

 lines along the keels of its upper scales. All the lower sur- 

 faces are creamy white, usually suffused with gray or slate 

 on the gular region and chest, and maculated with black. 



Length to anus 47 61 82 83 92 93 



Length of tail 124 184 190 207 204 212 



Snout to car !! 15 19 20 20 22 



Snout to interparietal 10 12 16 15 16 17 



Width of head 7 9 11 12 12 14 



Fore limb . 17 24 29 31 32 32 



Hind limb 34 47 56 56 61 65 



Base of fifth to end of 



fourth toe 16 23 25 25 28 29 



Distribution. The Desert Whiptail Lizard, Tiger Liz- 

 ard, or Swift Jack, ranges from western Texas north to 

 Kansas and Colorado, and thence west across Utah to south- 

 ern Idaho and eastern Oregon, and across Nevada to eastern 



