12 IGUANIDAB. 
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. 
Ventrals nearly as large as dorso-laterals: 
latter flat and keeled; scales on upper sur- 
face of snout flat, hexagonal ............ 3. cuviert, p. 23. 
Ventrals larger than dorso-laterals; latter 
granular and keeled .................. 4, edwardsit, 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 ventralsy; those on the vertebral line fre- 
quently more enlarged. Occipital scale considerably larger 
than the surrounding ones. No fold across the throat. 
A. Ventral 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 
snout and the ear-opening. 
Supraorbital semicircles separated from each 
other by two or three series of scales, and 
from the occipital by four or five series .. 5. gundlachii, p.25. 
é. Tibia shorter than the distance between the 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. 
+ Occipital scale separated from the supraorbitals. 
Supraocular scales keeled; scales on the 
vertebral line very feebly enlarged; 18 to 
25 lamelle under phalanges 1. and m1. of 
the: fOUrh COCs vie eseces a yo en alae yk ae 6. cristatellus, p. 26. 
Supraocular scales smooth; scales on the 
vertebral line scarcely larger than those on 
the flanks; 18 to 21 lamelle under pha- 
langes 21, AUT: secven ahaa wee ee 7. stratulus, p, 27. 
