Il6 CALIFORNIA ACADEMY OF SCIENCES. 



Phrynosoma cornutum. 



18S3, Yarrow, Bull. U. S. Nat. Mus., No. 24, pp. 66, 67, (part). 

 (1887, Belding, West Am. Scientist, iii, 24, p. 98.) 

 1893, Stejneger, N. A. Fauna, No. 7, pi. ii, figs. I-lc. 



Phrynosoma asio. 



(1883, Yarrow, Bull. U. S. Nat. Mus., No. 24, p. 67.) 

 [1885, Boulenger, Cat. Lizards, Brit. Mus., ii, p. 244 (part).] 

 (1887, Belding, West Am. Scientist, iii, 24, p. 98.) 



Phrynosoma hernandezi. 



[1883, Yarrow, Bull. U. S. Nat. Mus., No. 24, p. 68 (part).] 



The nostrils are pierced in the Hnes joining the super- 

 ciliary ridges with the end of the snout. There are 

 several longitudinal series of large pointed gular scales, 

 the exterior of which are continued back upon the gular 

 folds. There is a series of five very large pointed sub- 

 labial plates. The head spines are very large. They 

 are four temporals, one occipital and one postorbital, on 

 each side, and one large interoccipital. Occasionally 

 small spines are developed between the temporals. Be- 

 low the rictus is a broad spine usually without any, but 

 sometimes with a very small, spine behind it. There is 

 a row of four or five spinose scales in front of the occi- 

 pital spines. The other head scales, with few exceptions, 

 are flat and rugose, usually with irregular ridges radiat- 

 ing from near the center of each scale. There are two 

 groups of spines on each side of the neck, the lower 

 larger. The tail is bordered with a single row of lateral 

 spines, and bears a group of smaller ones behind the in- 

 sertion of the thigh. There are two series of periphero- 

 abdominal spines; the lower shorter than the upper, and 

 formed of smaller spines. The scales on the chest are 

 sometimes faintly keeled. Those on the abdomen and 

 basal part of tail are smooth; on the terminal part of tail, 

 keeled. The tympanum is naked. There are from six- 

 teen to twenty-two femoro-preanal pores. The males 

 have enlarged postanal plates. The tails of the females 



