NATURAL SCIENCES OF PHILADELPHIA, 
Description of New Genera and Species of Wortli American Lizards in the 
Mnsenm of the Smithsonian Institution. 
BY SPENCER F. BAIRD. 
Family IGUANID^. 
EtJPHRYNE, Baird. — Body very heavy aad clumsy. Tail shorter than the 
body; very thick and conical. Scales very small, but imbricated and angular 
throughout. A median dorsal band of about 20 rows, and a largepatch on 
%he sides of scales larger than the rest. Infra-orbitals in a series of small, 
nearly equal plates. Supra-cephalic plates all small, least on the outer part of 
the supra-orbital region. Upper labials rectangular, not imbricated. Posterior 
molars with five cusps; palate toothed. Claws very thick and stout, anterior 
much the longer. 
Euphryne obesus, Baird. — Width of head nearly equal to distance from nose to 
ear. Tail shorter than the body. General color of the young, olive green, with 
live broad transverse bars above from head to base of tail, and about as many 
oa the tail ; these rings yellow, dotted with red. Beneath pea green dotted with 
black. With increasing age, the bands become obsolete and disappear, the 
general color becoming reddish olive. 
The largest and heaviest of American Iguanidce, sometimes exceeding a foot 
in length. Abundant in the canons of the Colorado, of California, collected b}^ 
-Maj. Thomas, Mex. Boundary Survey, and Lt. Ives' Expedition. Type No. 41*72 
Crotapkytus reticulatus, Baird. — Infra-orbital chain in a series of 6 or 8 nearly 
equal plates. Scales on the gular fold much smaller than those between the 
fore legs. Above ashy gray, with a hexagonal reticulation of lighter, the in- 
terstices here and there dark brown. Chin and throat reticulated. Neither 
black collar nor light spots. More closely related to Crotaphytus coUaris, than 
to Crotaphytus (^Gambelia) wislizenii. 
Hah. — Laredo and Ringgold Barracks, Tex. Mex. Boundary Survey. J. H. 
Clark and A. Schott. Type 2692. 
Uta symmetrica^ Baird. — Larger dorsal scales in four regular series, two on 
either side of the median smaller ones. Head short, depressed, one and a half 
times as wide as deep. Tail one and a half times the head and body. General 
color light brown above, the belly white. Sides with broad transverse bands 
of blackish. Size of U. ornata. 
Hah.— Fori Yuma, Cal. Mex. Boundary Survey. A. Schott. Type No. 2760. 
Uta schottii, Baird. — Dorsal scales and size as in the last. Head pointed, 
narrow, nearly or quite as high as wide. General color nearly black, scarcely 
lighter beneath. Back with small blue spots. Tail banded laterally with the 
same. 
Hah. — Sta. Madelina, Cal. Mex. Boundary Survey. A. Schott. Type No. 
2761. 
Uma, Baird. — Ears distinct. very long infra-orbit '] plate. Palate without 
teeth. Outer face of upper labials plane and broadly v cal ; the labials them- 
selves much imbricated, and very oblique. Scales of body above equal, much 
smaller than ventral ones. Inter-orbital space with two series of plates. Claws 
very long, slender and straight. Sides with a round black spot. Tail ? 
(broken off.) 
Uma notata, Baird. — Head about two-fifths the head and body. Above light 
pea green, spotted with darker green. Beneath white. Head and body about 
two inches long. 
Hah. — Mohave Desert. Lt. Williamson, Dr. A. L. Heermann. Type No. 4124. 
HolbrooMa approzimans, Baird. — Similar in size and general character to //. 
maculata. Tail shorter than body. Two small vertical indigo black patches 
on the side of belly, entirely visible from' below ; with a light blue areola. 
1858.] 
