12 



IGUANID^. 



Synopsis of the Species. 



I. Tail strongly compressed and crested ; body strongly compressed, 



with a dorsal crest of small triangular lobes. 



Ventral scales smaller than dorso-laterals ; 



latter flat and smooth 1. equestris, p. 21. 



Ventrals slightly smaller than dorso-laterals ; 

 latter flat and keeled ; scales on upper sur- 

 face of snout tubercular 2. ricordii, p. 22. 



Veutrals nearly as large as dorso-laterals : 

 latter flat and keeled ; scales on upper sur- 

 face of snout flat, hexagonal 3. cuvieri, p. 23. 



Vt ntrals larger than dorso-laterals ; latter 



granular and keeled 4. edwardsii, p. 24. 



II. Tail more or less strongly compressed in the male, with a crested 



or serrated upper edge, which is at least indicated in the female 

 by a series of strongly enlarged keeled scales. Dorsal scales 

 small, as large as or a little larger than the laterals, and 

 smaller than the ventrals ; those on the vertebral line fre- 

 quently more enlarged. Occipital scale considerably larger 

 than the surrounding ones. No fold across the throat. 



A. Yentral scales smooth or very feebly keeled. 



1 The scales on the middle of the back larger than those on 

 the flanks. 



a. Tibia as long as the distance between the end of the 

 .nnout and the ear-opcuing. 



Supr?j.orbital semicircles separated from each 

 "t,'.er by two or three series of scales, and 

 from the occipital by four or five series . . 5. gundlachii, p. 25. 



h. Tibia shorter than the distance betAveen tlie end of the 

 snout and the ear-opening. 



a. Scales on upper surface of snout not keeled ; supra- 

 orbital semicircles formed of very large scales, in 

 contact or narrowly separated. 



* The width of the dilated part of the middle toes 

 equals at least two thirds the length of the slender 

 distal part. 



t Occipital scale separated from the supraorbitals. 



Supraocular scales keeled ; scales on the 

 vertebral line very feebly enlarged; 18 to 

 25 lamelliE under phalanges n. and in. of 

 the fourth toe 6. cristatellus, p. 26 . 



Supraocular scales smooth ; scales on the 

 vertebral line scarcely larger than those on 

 the flanks ; 18 to 21 lamella; under pha- 

 langes II. and III 7. stratulus. p. 27. 



