212 IGUANIDE. 
Dorsal scales equal, rhomboidal, sharply keeled, a little smaller than 
the ventrals, but much larger than the laterals. Tho adpressed hind 
limb reaches the eye; scales on upper surface of limbs larger than 
dorsals. Twelve to fourteen femoral pores on each side. Tail once 
and two thirds to once and three fourths as long as head and body. 
Upper caudal scales much larger than dorsals; subcaudals smooth 
or very obtusely keeled. Bluish or brownish above, dotted with 
lighter, with or without a double series of dark transverse spots along 
the back ; female with a more or less distinct yellowish, black-edged 
dorso-lateral band; a large deep-blue spot on each side behind the 
axilla; belly whitish or bluish; throat blue in the male, blackish- 
blue spotted with white in the female. 
millim. millim. 
Total length...... 150 Fore limb ........ 25 
Head: uss pic eine 15 Hind limb ........ 45 
Width of head.... 10 Deilvicie nes eset eo 95 
Body we eeetneks 40 
California; New Mexico. 
ao. La Paz. Smithsonian Institution [P.]. 
(One of the types.) 
bs. La Paz. Smithsonian Institution [P. ]. 
c-d. 2. Deming, N. Mexico. Mr. Forrer [C.1. 
3. Uta nigricauda. 
Uta nigricauda, Cope, Proc. Ac. Philad. 1864, p. 176. 
A single frontal, separated from the occipital by the pair of 
frontoparietals ; four large supraoculars; three or four projecting 
pointed scales on the anterior border of the ear. A strong pouch 
on each side of the throat, not connected by a transverse fold. A 
band of six or seven longitudinal rows of equal-sized, hexagonal, 
strongly keeled dorsal scales, smaller than ventrals; lateral and 
dorso-lateral scales minute. The adpressed hind limb reaches 
between the shoulder and the ear; scales on upper surface of hind 
limb larger than dorsals. Eleven femoral pores on each side. 
Upper caudal scales much larger than ventrals, strongly keeled, 
mucronate; subcaudals sharply keeled. Dark grey above, with 
transverse blackish bands on the body, interrupted on the vertebral 
line; the anterior of these bands, on the scapular region, intense 
black ; sides and limbs with whitish dots ; tail blackish; belly blue 
on each side (male), deepest near the narrow whitish median line. 
[Throat in males orange. | 
millim. 
Total length...... 95 Fore limb.......... 19 
Gad! caeriacieas ss 10 Hind limb ........ 28 
Width of head.... 8 Tail (reproduced).... 50 
Body ..06 es see 35 
Lower California. 
aod. La Paz. Smithsonian Institution [P.]. 
