90 3. IGUANIDJE 



colonial buff, faintly banded with three broad rings of deep 

 olive buff." 



Length to anus 130 14-2 150 180 193 210 



Length of tail 132 111+ 151 198 210+ 215 



Snout to orbit 11 12 13 14 16 19 



Snout to ear 26 27 28 36 40 45 



Width of head 24 27 27 35 38 44 



Fore limb 58 66 62 76 78 87 



Hind limb 75 91 85 102 113 121 



Base of fifth to end of . 



fourth toe 24 26 28 32 34 38 



Distribution. The Chuckwalla is known from south- 

 western Utah, southern Nevada, western Arizona, south- 

 eastern California, and northern and central Lower 

 California. 



In Utah, it has been taken in Washington County, 

 where it is common among the red standstone cliffs near 

 St. George and in the Canyon of the Lower Santa Clara. 

 It has been secured near Rockville and Leeds, in the same 

 county. 



In Nevada, it has been collected in Nye County at 

 Rhyolite and in Pahrump Valley. 



In Arizona, it has been secured in Maricopa (Sentinel, 

 Cave Creek, and Tempe), Yavapai (Turkey), Coconino 

 (mouth of Bright Angel Creek, Lees Ferry), and Mohave 

 (Mellen) counties. 



In California, it is restricted to the desert areas east of 

 the mountains, where it has been collected in Inyo (Fur- 

 nace Creek, Death Valley, Hanopee Canyon, Willow 

 Creek, Panamint Mountains, Amargosa River, Lookout, 

 Argus Mountains, Beveridge Canyon, Inyo Mountains, 

 Shoshone, Little Lake, Darwin), San Bernardino (Bar- 

 stow, Daggett, Slate Range, Turtle Mountains, five miles 

 south from Lovic, Victorville, 14 miles northeast from 



