Art. VI.] Herrick, Geology of New Mexico. 137 
Description : Nostrils opening above the canthi rostrales; 
gular scales small, granular; one gular fold; a series of large, 
spinose sublabial scales which increase posteriorly; infralabials not 
separated from sublabials (in small specimens at least) by a 
series of scales but the two series in juxtaposition; two groups 
of weak spines on either side of neck; head spines rather short, 
consisting of from five to seven temporals, one occipital and 
postorbital; three scales in front of the occipital larger than the 
remaining head scales which are roughened with granulations 
and ridges and, except those in front of the occipital and tem- 
poral spines nearly flat. 
Back, tail and upper surfaces of the limbs covered with 
scattered, slightly elevated, keeled, tubercular scales; one series 
of peripheral scales which disappears behind or is obsolescent ; 
tail edged with small spines; scales in front of arm large, 
pointed, strongly keeled; those on breast, abdomen and proximal 
part of tail smooth; tympanum covered with scales; femoral 
pores nine on a side, invading the preanal region; males with 
enlarged postanal plates. 
General color above, gray, yellowish brown, etc., variously 
marbled with slaty, brown or blackish; a large dark area on 
either side of the neck often extending back to in front of hind 
legs, tail transversely banded. 
Genus, Uta. 
Head and body moderately depressed and shorter than the 
tail; tympanum distinct; no dorsal crest; dorsal scales small, 
keeled, either uniform or heterogeneous; head plates large, the 
interparietal being larger than the ear opening; one or more 
transverse gular folds, the anterior one with denticulated edge; 
labials not imbricated; superciliaries imbricated; femoral pores 
present; lateral teeth tricuspid; no pterygoid teeth; a large 
sternal fontanelle; no abdominal ribs; males with enlarged post- 
anal plates. This is a genus confined to Mexico and the south- 
western states of the Union. 
