186 



IGUANID^. 



small ; upper surface of head covered with large convex or conical 

 and spinose, rough, polygonal shields ; rostral and mental very 

 small; ten to twelve upper and as many lower labials. Throat 

 strongly plicate, covered with minute granular scales. A dorso- 

 nuchal crest of lanceolate spines, highest on the nape, sometimes 

 SLibinterrupted between the shoulders. Scales on the body very 

 small, keeled on the back, smooth on the belly. Limbs strong ; 

 digits rather short, the third toe strongly denticulated along the 

 inner side of the basal joint. A series of twenty to thirty pores on 

 each side ; frequently a second parallel series of a few pores. Tail 

 about once and a half the length of head and body, strongly com- 

 pressed, crested above, covered with cross series of equal keeled 

 scales. Colour black or blackish brown ; abdomen and lower sur- 

 face of thighs frequently dirty white ; young brown above, with 

 pale spots or dots, and more or less distinct darker cross bands on 

 the back. 



33. CONOLOPHUS. 



Amhlyrhynchus, part., Dum. 8^- Bibr. iv. p. 193. 

 Couolophus, Fitzing. Si/st. liept. p. 55. 

 Trachj'cephalus {non Tschiidi), Gray^i Cat. Liz. p. 188. 



Tympanum distinct. Body a little depressed ; a slight dorsal 

 crest ; dorsal scales small. Head-scales slightly enlarged. No gular 

 pouch ; a feeble transverse gular fold. Digits compressed, with 

 keeled lamellae interiorly. A long scries of femoral pores. Tail 



