REPTILES OF THE PACIFIC COAST. 99 



sometimes naked. Femoral pores varying from seven 

 to twelve on each side, often invading preanal region. 

 Males with enlarged postanal plates. 



The general color of the upper surfaces is white, gray, 

 yellow, brown, or red, variously marbled with black, 

 brown, or slate. A large dark area on each side of the 

 neck is much more distinct in young than in adults. 

 The usual dark dorsal blotches are very indistinct, as 

 are also the dusky cross-bands 011 the tail. The head is 

 usually dotted with blacker brown. The lower surfaces 

 are yellowish white, uniform, or spotted with black, 

 brown, or slate. 



Length to anus 30 38 48 77 85 94 



Length of tail 14 29 22 40 45 46 



Snout to ear 7 8 10 15 16 16 



Width of head* 9 12 14 21 22 23 



Length of occipital horn 2 2 3 6 8 8 



Fore limb 16 19 22 35 34 37 



Hind limb 20 25 30 46 48 52 



Base of fifth to end of fourth toe 8 9 10 14 15 16 



Distribution. The range of this horned toad in Cali- 

 fornia includes the Colorado and Mojave Deserts of San 

 Diego, Riverside, San Bernardino, and Kern Counties, 

 and the hot, arid portions of the Great Basin. It may, 

 perhaps, be found also in the northeastern corner of the 

 State, for it has been reported from Oregon and is very 

 common on the plains near the Snake River in Idaho. 

 It has not been taken in California anywhere west of 

 the deserts. 



It crosses Nevada (Pyramid Lake, Ash Meadows, 

 Amargosa, Vegas Valley, Pahrump Valley, Pahranagat 

 Valley, Indian Spring Valley, Panaca, Grapevine Mts.) 

 to western Utah. 



Habits. Like other species of this genus, Phrynosoma 



*To tips of the temporal horns. 



