242 IGUANIDE. 
Tapaya orbicularis, Girard, U. S. Explor. Exped., Herp. p. 895 ; 
Bocourt, Miss, Sc. Mex., Rept. p. 221, pl. xi. fig. 1. 
Head (spines not included) as broad as long or broader than long ; 
nostril pierced in the line of the canthus rostralis; tympanum 
naked; the head-spines of moderate size, nearly horizontal or 
obliquely turned upwards; there are on each side a low post- 
orbital, an occipital, and three temporals; the occipitals are the 
largest, and their extremities on a line with or beyond the line of 
the longest temporal; the length of the occipital spines equals about 
the diameter of the eye. Lower labials terminating in a series of 
three or four large, compressed, pointed scales; a series of enlarged 
scales, as large as or a little larger than, and parallel with, the 
lower labials; gular scales equal, smooth ; gular fold very strong, 
forming a deep pouch on each side of the neck, which bears two 
short parallel longitudinal series of erect spines. Back and hind 
limbs with scattered large spinose keeled scales, which are longer 
than broad and obliquely directed upwards and backwards ; a regular 
lateral series of spines ; pectoral and ventral scales perfectly smooth. 
Fifteen to twenty-one femoral pores on each side in the male, 
ten to eighteen in the female, the series sometimes meeting in the 
middle. Male with enlarged postanal scales. Tail twice to thrice 
as long as the head. Brownish, yellowish, or reddish above, with 
one or two series of large blackish spots on each side of the back ; 
these spots sometimes pale-bordered posteriorly ; a large black spot 
on each side of the nape is constant ; lower surfaces yellowish white, 
spotted or marked with black. 
millim. millim 
Total length...... 135 Fore limb ........ 37 
Head ass) eacosvas 20 Hind Md weg os 49 
Width of head.... 21 atl Sis ipetewre ee ak 53 
BOd yes oes ae aK sh 62 
Mexico. 
a-c. SQ. City of Mexico. Mr. Doorman [C.}. 
do. Plateau of Mexico, 7500ft. P. Geddes, Esq. [P.]. 
e-g. 3. Ciudad. Hr. Forrer (C. |. 
hi. Q & her. Mexico. J. E. Harting, Esq. [P.]. 
k-l. @ & her. Mexico. Mr. Geale [C.]. 
m. Ad., stuffed. Mexico. W. Ogilby, Esq. [P.]. 
Var. cortezii. 
Phrynosoma orbiculare, Wiegm, Herp. Mex. pl. viii. f. 1. 
Tapaya cortezii, Bocourt, Miss, Se, Mex., Rept. pl. xi. fig. 2. 
orbicularis, var. A, Bocourt, l, c. p. 223. 
The occipital spines are not longer than, and do not extend 
posteriorly quite as tar as, the longest temporals. Head much 
broader than long. 
a-b. 3. Puebla 
b Q. Orizaba, 
c. Q. Jalapa. Mr. Hoege [C.]. 
