H6 3. IGUANIDM 



eral subocular plates, middle one very long and strongly 

 keeled. Superciliaries rather small, but strongly imbricate. 

 Eyelids bearing a well-developed fringe. Supralabials 

 strongly imbricate, and produced laterally so as to form a 

 series of curves when seen from above. Infralabials small, 

 juxtaposed. Below them, several series of flat sublabial 

 plates. Gulars granular and smooth, growing larger and 

 imbricate on posterior fold. Back and sides covered with 

 small flattened granules, which change gradually into 

 much larger smooth ventrals. A dermal fold usually ex- 

 tending along each side between limbs. Tail of moderate 

 length, much flattened, its scales slightly imbricate, and 

 along its edge, pointed. Limbs very long and slender. 

 Ear-opening large, without denticulation. Femoral pores 

 varying from 12 to 19; average in 79 thighs, 14.53. 



The general color above is grayish, dotted and spotted 

 with white or pale gray, and with dark dorsal blotches 

 vv'hich are most distinct in females and young, and may be 

 obsolete in adult males. The top of the head is cream or 

 gray, clouded with dark slaty gray or olive. The upper 

 surfaces of the limbs are crossed by more or less obsolete 

 bands of dark brown or blackish slate. A dark stripe, bor- 

 dered above and below with white, runs along the back of 

 the thigh. The upper surface of the tail is gray or light 

 brown with cross-bars of dark brown in both sexes; not 

 black in males. The posterior borders of these bars are 

 strongly undulate or pointed from the base to beyond the 

 middle of the tail. The throat is white, more or less 

 clouded with bluish or purplish gray. The lower surface 

 of the tail is white with about eight (seven to 1 1 ) cross-bars 

 of intense black. The belly is whitish. Males have a large 

 blue patch, marked with two oblique wedge-shaped black 

 blotches, on each side, and rarely a small additional spot. 

 These blotches are intense black in males, sharply defined, 



