210 IGUANIDE. 
body. Hind foot short, less than one third of head and body. Six 
or eight supraocular scales surrounded by granules; scales of snout 
tubercular; labials less elongate, five oblique, one flat. Femoral 
pores twelve or thirteen. Colour light brown, with six pairs of 
transverse dark brown bars between the scapular region and groin, 
which extend downwards and backwards on the abdomen; their 
posterior border is serrate or digitate, and edged with yellowish, 
producing a variegated pattern; a pale band on inferior part of 
side, which is crossed by the ends of the lateral spots; no bluish- 
black spots on the sides of the belly ; trausverse bluish-black spots 
on the inferior side of the tail. 
Texas. 
48. UTA. 
Uta, Baird § Gir. in Stansb. Exped. Gr. Salt Lake, p. 344. 
Urosaurus, Hallow. Proc. Ac. Philad. 1854, p. 92. 
Phymatolepis, 4. Dum. Arch. Mus. viii. p.548; Bocourt, Miss, Se. 
Mex., Rept. p. 165. 
Tympanum distinct. Body depressed; no dorsal crest ; dorsal 
scales small, keeled, uniform or heterogeneous. Upper head-scales 
enlarged, occipital very large. A strong transverse gular fold, with 
denticulated edge ; a second anterior fold sometimes present. Digits 
with keeled lamelle inferiorly. Femoral pores. Tail moderate, 
subcylindrical, covered with large keeled scales. Lateral teeth tri- 
cuspid ; no pterygoid teeth. A large sternal fontanelle. No ab- 
dominal ribs. 
North America and Mexico. 
In all the species the head is relatively small, the snout short, 
with angular canthus ; nostril superior, near the end of the snout ; 
upper head-scales smooth. The digits are slender and pectinate 
inferiorly. Males possess enlarged postanal scales. 
Synopsis of the Species. 
I. Dorsal scales uniform, larger than those on the flanks. 
Dorsal scales minute, a little larger than 
those on the sides .............00. 1. stansburiana, p. 211. 
Dorsal scales much larger than those on 
TRE SIdES ide wan Lace eelt ent .. 2, elegans, p. 211. 
II. A band of six to eight longitudinal series of equal-sized 
enlarged scales along the middle of the back. 
No lateral series of enlarged scales .... 3. nigricauda, p. 212, 
A lateral series of scales imitating the 
lateral line of fishes .............. 4. ornata, p. 212° 
III. Dorsal lepidosis heterogeneous. 
A band of six or eight longitudinal series 
of enlarged dorsal scales, the two 
