38. Ci'ENOSAUEA. 197 



y-z, a-i3. Yg. Vera Cruz, 



y. Ho-r., stuffed. _ Tehuantepec. 



b-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. 



f. Ad., stuffed. Mexico. 



C. Apparently the C. cycluroides and comj)leta 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 three series of 

 smaller, strongly keeled scales. 



O. Salvia, Esq. [P.]. 



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. 



o-TT. S $ • Colon. 



2. Ctenosaura liemilopha. 



Iguana (Cyclura) acanthura (non Shaw), Blainv, Noiiv. Ann. Mus. 



iv. 183o, p. 288, pi. xxiv. fig. 1. 

 Cyclura acanthura, part., Dum. Sf Bihr. iv. p. 222. 



(Ctenosaura) hemilopha, Cope, Proc. Ac. Philad. 1863, p, 105. 



Ctenosaura acanthura, Bocourt, Miss. Sc. Me.r., Rept. p. 138. 

 interrupta {Du(/es), Bocourt, 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 tho 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 tho seventh, composed of only two rings 

 of scales. Five femoral pores. Olive-grey or green above, sides, 

 Bacral region, and limbs, with fine dark brown network ; back with 



