308 3. IGUANID^ 



they are generally bluish slate but occasionally nearly as in 

 the males." 



Length to anus 41 



Length of tail 64 



Snout to car . 1 



Width of head 8 



Snout to back of 



interpairetal 9 



Fore limb 19 



Hind limb 31 



Base of fifth to end of 



fourth toe 13 IS 22 20 21 22 



Distribution. — The Western Blue-bellied, Fence or Rock 

 Lizard occurs over a wide area which includes western Lower 

 California north of latitude 30 degrees, southern and east- 

 ern California, including the southern part of the San Joa- 

 quin Valley and both slopes of the southern Sierra Nevada, 

 all of Nevada, southern Idaho, and western Utah. Mr. 

 Camp states (1916) that intergrades between this sub- 

 species and Sceloporus occidentalis ocddentalis occur in 

 a zone which extends from San Luis Obispo County 

 to western Merced County, thence across the San Joa- 

 quin Valley to Coulterville, Mariposa County, and 

 thence northward over the Sierra Nevada to eastern Modoc 

 County. The range of S. o. occidentalis extends north and 

 west from this zone; that of S. o. biseriatus, south and cast. 



In California, it has been collected in San Diego (San 

 Diigo, Dulzura, Campo, Jacumba at 2825 feet, Poway, 

 Witch Creek, Julian, Santa Ysabel Valley 3000-4000 feei, 

 vicinity Julian, Cuyamaca Mountains, Chihuahua Moun- 

 tains, Escondido, Oak Grove, Warner Pass), Riverside 

 ''Riverside, Temescal, Gavillan, Hemet Valley at 5,000 feet, 

 San Jacinto, Vallevista at 1 700 feet, Cabazon at 1700 to 2000 

 feet, Banning at 2200 feet, Hemet Lake at 4400 feet, Ken- 



