38. crENOSAUBA. 197 
y-2z, a-B. Yg. Vera Cruz. 
y. Her., stuffed. Tehuantepec. 
6-e. Yg. Tehuantepec. 
B. Scales on the body and limbs as in the preceding; caudal 
spines stronger, the verticils, from the sixth and seventh, 
separated from each other by a single series of nearly smooth 
scales. 
¢. Ad., stuffed. Mexico. 
C. Apparently the C. cyclwroides and completa of Bocourt. Dorsal 
scales larger, more distinctly keeled ; scales on lower surface of 
leg rather larger ; caudal spines usually stronger, the spinose 
verticils separated from each other by two or threo series of 
smaller, strongly keeled scales. 
n Q. Chiapas. O. Salvin, Esq. [P.]. 
6. 9, stuffed. Belize. 
« Her. Belize. 
x. 3, stuffed. Honduras. 
A. Ye. Honduras. 
pw, v, &. Hgr. & yg. —? 
D. Dorsal scales intermediate as to size between A and C, distinctly 
keeled ; scales on lower surface of leg as small as in A; caudal 
scales as in C. 
om SQ. Colon. 
2. Ctenosaura hemilopha. 
Iguana (Cyclura) acanthura (non Shaw), Blainv. Nouv. Ann. Mus. 
iv. 1835, p. 288, pl. xxiv. fig. 1. 
Cyclura acanthura, part., Dum. § Bibr. iv. p. 222. 
—— (Ctenosaura) hemilopha, Cope, Proc. Ac. Philad. 1863, p. 105. 
Ctenosaura acanthura, Bocourt, Miss. Sc. Mex., Rept. p. 188. 
— interrupta (Duges), Bucourt, Le Natur. 1882, p. 47. 
Scales on the body very small, smaller on the back than on the 
belly, smooth. Dorso-nuchal crest extending to the sacrum in 
the male, not beyond the anterior two thirds of the back in the 
female, not continuous with caudal. Tail depressed at the base, 
above with alternate rings of large spinose and small smooth scales ; 
only the first four whorls of spines separated from one another by 
two or three series of smaller scales; the spines on the vertebral 
line strong and forming a crest, but less developed than those on 
the sides; scales on lower surface of tail narrow and keeled, each 
segment, beginning from the seventh, composed of only two rings 
of scales. Five femoral pores. Olive-grey or green above, sides, 
sacral region, and limbs, with fine dark brown network ; back with 
