228 IGUANIDE. 
Sceloporus occidentalis, Baird §& Gir. Proc. Ac. Philad. 1852, p. 175; 
Girard, U.S. Expl. Exped., Herp. p. 883, pl. xix. figs. 8-14. 
frontalis, Bard & Gir. l.c.; Gir. le. p. 884, pl. xix. figs. 1-7. 
—-- longipes, Batrd, Proc. Ac. Philad. 1858, p. 254. 
Head-shields smooth or rugose; a series of four or five large 
transversely dilated supraoculars; two canthal scales; occipital as 
long as broad, or a little longer than broad, larger than the parietals; 
anterior border of ear wilh a denticulation of pointed scales not 
larger than those preceding. Dorsal scales much larger than ven- 
trals. strongly keeled, more or less strongly mucronate, entire, tri- 
cuspid, or very indistinctly denticulated, forming parallel longitudinal 
series; thirty-three to forty scales between the occipital] shield and 
the base of the tail; seven to nine (exceptionally six) scales cor- 
respond tothe length of the shielded part of the head; lateral 
scales keeled, directed obliquely upwards and backwards, nearly as 
large as dorsals; ventrals smooth, bicuspid: thirty-eight to fifty 
scales round the middle of the body. The adpressed hind limb 
reaches between the cervical fold and the orbit; tibia as long as, 
or longer than, the shielded part of the head; the distance between 
the base of the fifth toe and the extremity of the fourth exceeds 
the distance between the end of the snout and the posterior border 
of the ear. Thirteen to seventeen femoral pores. Caudal scales as 
large as or a little larger than dorsals. Male with enlarged post- 
anal scales. Greyish, brownish, or olive above, usually with un- 
dulating dark brown bands across the back and fine lines across 
the head ; sometimes a more or less distinct lighter dorso-lateral 
band. Lower surfaces yellowish-white in the female, often spotted 
with brown or with a brown median ventral line, and a bluish spot 
on each side of the throat. Male with the throat and the sides of 
the belly blue, edged with black, the pectoral and median ventral 
regions yellowish ; the throat sometimes nearly entirely black, the 
blue reduced to a round spot on each side. 
millim. millim 
Total length ...... 155 Fore limb ........ 29 
Hesdawicneeehe ys 16 Hind limb........ 44 
Width of head .... 14 Tail .... wo. 85 
Body teccontawaw en 54 
North America, Mexico, Guatemala. 
New Orleans. 
a 9. 
6, c-d. Sg. California. J. K. Lord, Esq. [P.]. 
e-f. Q. California. M. Sallé [C.]. 
g-h. S. California. Mr. F. Gruber [C.]. 
-K, 1 SO. N. America. Dr. J. Green [P.}. 
m 32. N. America. E. Doubleday, Esq. [P.]. 
n 3. N. America. Lord Ampthill [P.]. 
2. N. America. Sir R. Murehison [P.]. 
p. 5 Yzabal. O. Salvin, Esq. (C.J. 
g. 3. 
—?P 
