6 IGUANID 4, 
II. Femoral pores present. 
A. Third and fourth toes equal. 
Body strongly compressed ; no dorsal crest. 
6. Polychrus, p. 98. —— 
B. Fourth toe longer than third. 
1, Anterior teeth, as well as the laterals, trilobate. 
Tail strongly compressed, crested ; a rudiment of web between the 
LOGS. apna RE LA Re RRS 32. Amblyrhynchus, p. 185. 
Tail roundish, slightly compressed ; toes quite free. 
33. Conolophus, p. 186. 
2. Lateral teeth with denticulated crowns. 
Asmall gular pouch ............ 34. Metopoceros, p. 187. 
A large non-dilatable gular appendage. 
35. Iguana, p. 189. —— 
3. Lateral teeth tricuspid (sometimes with one or two addi- 
tional cusps) or subconical. 
a Head without spines. 
a. Series of femoral pores short ; a transverse gular fold. 
Body compressed; a dorsal crest ; male with a gular sac. 
36. Brachylophus, p. 192. 
Body scarcely compressed ; a dorsal erest ; no gular sac. 
38. Ctenosaura, p. 195, 
Body depressed ; no dorsal crest; dorsal scales equal. 
39. Cachryx, p. 199. 
Body depressed ; no dorsal crest; dorsal scales heterogeneous. 
40. Hoplocercus, p. 199. — 
f. Series of femoral pores extending on nearly the whole 
length of the thigh, or no transverse gular fold. 
* A vertebral crest or denticulation. 
A small gular sac and a feeble transverse gular fold. 
37. Cyclura, p. 1938. 
No gular pouch; a strong transverse gular fold. 
41. Dipsosaurus, p. 201. 
** No dorsal crest; body depressed. 
¥ Occipital scalo small; a transverse gular fold. 
Tail scarcely longer than head and body. 
42. Sauromalus, p. 202. 
