^°?89:iy''] PROCEEDINGS OF THE NATIONAL MUSEUM. 41 



tlie larger size oftlie latoral scales, tbc greater prominence of the femo- 

 ral pores, and the brilliant blue luottlings on the ventral surface of 

 the $ of (vncus easily distinguish them. Moreover, ameus, when full 

 grown, is a smaller species than variabilis. 



Sceloporus microlepidotus Wiegmann. 

 Herp. Mcx., l834, 51. Boulenger, Ccat. Liz. Brit. Mus., ii, 232. 



■ The small-scaled lizard was the most abundant species on tne slope 

 of the mountain from 9,000 to 14,000 feet. They were continually seen 

 along the pathway, and when pursued took refuge beneath tiillen rocks 

 or in the clumps of dense bunch grass. One was surprised at a height 

 of 14,000 feet, with a half-eaten beetle, a species of Laclmosterna, in 

 his mouth, and was chased quite a distance before he dropped his 

 prey. 



The si)ecies is at once known by the small size of the dorsal .scales, 

 there being on an average about seventy-five between the occipital 

 plate and the base of tail. Four males, five females. 



PHRYNOSOMA Wiegmann, 1828. 



Phrynosoma orbiculare Wiegmann. 



Herp. Mex., 1834, 53. Girard, Stansb. Rep. Grt. Salt Lake, 1852, 359. Bonlcnger, 

 Cat. Liz. Brit. Mus., ii, 241. 



This, the only species of ''horned toad" taken, was common in the 

 fields about San Andres, between 7,500 and 9,000 feet, but was seen at 

 no other locality. Those secured evidently belong to the variety 

 Cortezii Bocourt, as the occipital spines are shorter than the longest 

 temporal ones and the head is broader than long. 



Measurements — adult $ : 



Milimeters. 



Total length 131 



Length of head 19 



Width of head 24 



Length of body 69 



Length of tail 43 



Length of fore limb 34 



Length of hind limb 42 



ANGUID^E. 

 GERRHONOTUS Wiegmann, 1828. 

 Gerrhonotus imbricatus Wiegmann. 

 Herp. Hex., 1834, PI. x, Figs. 2, 5. Boulenger, Cat. Liz. Brit. Mus., ii, 272. 



A single specimen of this genus was captured on the slope of the 

 mountain at a height of 11,000 feet. It was creeping slowly through 

 the bunch grass, which, at that height, covered the soil, and when dis- 

 covered made but little effort to escape, but darted forth its tongue 

 rapidly alter the manner of a snake. 



