13. PHRYNOSOMA 387 



lower labial and separated from it by a single scale. All 

 head-scales keeled and wrinkled. Clusters of large spines 

 on folds on side of neck. Back and upper surfaces of hind 

 legs and tail with scattered, larger, bluntly keeled scales, 

 largest with bases surrounded by "rosettes" of smaller 

 scales larger than those of back generally. Body with 

 fringe of one series of peripheral, spinous scales. Scales of 

 fore legs and lower surfaces strongly keeled. Tympanum 

 not covered with scales. A series of nine to 14 femoral 

 pores on each side, not meeting medially. Males with 

 enlarged postanal plates. 



The color above is pale yellowish gray, (reddish in 

 life), with two faint, narrow, brownish bands across the 

 lower back. The inferior surfaces are whitish, with very 

 obscure dusky spots. 



Length of anus 76 



Length of tail 28 



Snout to tip of extreme temporal scale 25 



Width of head 28 



Fore limb 40 



Hind limb 53 



Distribution. This species is known only from two 

 specimens said to have been collected in the State of Sonora, 

 Mexico, a short distance south of the border of Arizona. 



Habits. Mr. Raymond Ditmars, who kept one of the 

 specimens alive for about a year, states that it fed upon 

 large ants, grasshoppers, crickets and mealworms. When 

 annoyed it would arch its back, point its snout downward, 

 and make jumps of fully an inch from the ground, each 

 jump being accompanied by a little hiss. 



