204 IGUANIDE. 
d: 2. 
millim. millim, 
Total length .......... 302 306 
Ca is ee decs gaat as 31 mi 
Width of head ........ 27 22 
Ody” serio ee srecees aerate att 76 73 
Fore limb ............ 44 41 
Hind limb ............ 90 82 
MPAA, | near iceatantte Ge ssaaale 195 206 
Southern and Central United States ; North Mexico. 
a-e. SQ. N, Texas. E. D. Cope, Esq. [E.]. 
ied: Creek Boundary. 
g. Q. Colorado. W. Treharne, Esq. [P.]. 
2. Crotaphytus wislezenii. 
Crotaphytus wislezenii, Baird § Gir. Proc. Ac. Philad. 1852, p. 69, 
and in Stansbury’s Exped. Gr. Salt Lake p. 340, pl. iii., and U.S. 
Mex, Bound. Surv., Rept. p. 7, pl. xxxi.; Bocourt, Miss. Se, Mex., 
Rept. p. 155, pl. xvii. bis. fig. 4. 
—— gambelii, ated & Gir. Proc. Ac. Philad. 1852, p. 126. 
asciatus, Hallow. Proc. Ac, Philad. 1852, p. 206, and in Sit- 
greave’s Exped. Zuni § Color. Riv. p. 115, pl. v. 
Leiosaurus hallowellii, 4. Dum. Arch. Mus. viii. p. 583. 
This species differs from C. collaris in the following points :— 
Head smaller and narrower; nostril more lateral; upper head- 
scales smaller, those bordering the orbit above not differentiated, in 
three or four longitudinal series on the interorbital region; a much 
elongate scute below the orbit. Male with enlarged postanal scales. 
Coloration very variable; no black collar. The specimens in the 
collection are greyish brown above, with large round brown spots 
and narrow transverse light (vermilion) bands on the back, limbs, 
and tail; lower surfaces white, throat spotted or streaked with grey. 
e 2. 
millim. millim. 
Total length .......... 314 255 
MY 6a dh. sh sec tece Mew ciel sae 26 26 
Width of head ........ 20 20 
BOOY Go. 2a ak gecberng vend 78 79 
Fore limb ............ 43 44 
Hind limb ............ 85 87 
of AE ene ere ee 210 150 
Western North America, from Oregon to North Mexico. 
a. Yg. Oregon. 
b-c. SQ. Fresno, California. Smithsonian Institution [P.]. 
d. Q. California. 
