6 IGUANID^E. 



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 

 toes 32. Amblyrliynchus, p. 185. 



Tail roundish, slightly compressed ; toes quite free. 



33, Conolophus, p. 186. 



2. Lateral teeth with denticulated crowns. 



A small gular pouch 34. Metopoceros, p. 1S7. 



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 crest ; 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. 



/3. Series of femoral pores extending on nearly the whole 

 length of the thigh, or uo transverse gular fold. 



* A vertebral crest or denticulation. 

 A small gular sac and a feeble transverse gular fold. 



37. Cyclura, p. 193. 



No gular pouch ; a strong transverse gular fold. 



41. Dipsosaurus, p. 201. 



** Xo dorsal crest ; body depressed. 



t Occipital scale small ; a transverse gular fold. 

 Tail scarcely longer than head and body. 



42. Sauromalus, p. 202. 



