172 3. IGUANIDM 



throat is white or yellow, sometimes marbled with dusky. 

 The belly is white or yellow, with two or three black bars 

 on. the sides usually surrounded with blue. The tail is 

 grayish or brownish above, white or yellow below. 



Length to anus 52 53 56 58 64 67 



Length of tail 40 58 66 55 56 60 



Snout to back of inter- 

 parietal 9 9 10 10 11 11 



Width of head 9 9 9 10 11 11 



Fore limb 21 26 29 28 26 30 



Hind limb 33 42 44 43 40 45 



Base of fifth to end of 



fourth toe 12 17 17 17 14 17 



Distribution. — This Holbrookia is very common in parts 

 of Arizona and has been recorded as taken at Dome Canyon, 

 Nevada, probably in error for Dome Canyon, Millard 

 County, Utah. Whether from Utah or Nevada, this record 

 needs confirmation. Yarrow has recorded a Holbrookia as 

 having been collected at Fort Tejon, California, but there 

 is not the slightest probability that this is correct. Mocquard 

 has reported, under the name Holbrookia frofiriqua, two 

 specimens from Santa Rosalia, Lower California, which may 

 belong to this subspecies. 



In Arizona, it has been collected in Coconino (Painted 

 Desert near Moencopie, Little Colorado River), Yavapai 

 (Fort Whipple, Prescott, Fort Verde), Maricopa (Cave 

 Creek), Navajo (Winslow, Oraibi), Apache (eight miles 

 N. W. of Adamana, Chin Lee), Pima (Tucson, Fort Lowell, 

 Sabino Canyon, Catalina Mountains, Sonora Road Canyon 

 in the Tucson Mountains, Gija River, Sawmill Canyon in 

 the Santa Rita Mountains, Mesa near the Baboquivari Moun- 

 tains, Sycamore Canyon in the Baboquivari Mountains), 

 Santa Cruz (Camp Crittenden, Calabasas, Fort Buchanan, 

 Nogales, Santa Rita Mountains near Pete Mountain and in 



