242 3. IGUANIDJE 



smooth and usually more or less con vex j interparietal lar- 

 gest. Frontal plate usually divided transversely. Throe 

 to five supraoculars, enlarged, and separated from frontals 

 by one row of granules. Superciliaries long, somewhat pro- 

 jecting laterally, and strongly imbricate. Central subocular 

 very long, narrow, and strongly keeled. Rostral and supra 

 labials very long and low. Other plates of upper surface 

 of head very irregular in size and position. Symphyseal 

 plate rather small, followed by three or four pairs of lar- 

 ger smooth plates separated from small infralabials by from 

 one to three series of moderately enlarged sublabials. Gu^sr 

 region covered with small, smooth, hexagonal scales, which 

 change gradually into granules on sides of neck, and into 

 larger scales on strong transverse gular fold where they are 

 about the size of those on belly. Edge of gular fold with 

 a series of larger projecting scales. Ear-opening with strong 

 denticulation of three or four pointed scales. Several longi- 

 tudinal dermal folds usually present on sides of body and 

 neck. Back covered with small keeled scales of nearly uni- 

 form size, but larger, more strongly keeled and more 

 acutely pointed than the dorsals of U. s. stansbu- 

 riana, becoming gradually granular on neck and sides. 

 Number of dorsal scales in line from interparietal plate to a 

 line joining posterior surface of thighs varying from 78 to 

 103$ average, 86.5. Scales on tail largest, strongly keeled, 

 sharply pointed, and larger above than below. Posterior 

 surface of thighs and arms covered with small granular 

 scales similar to those on sides of body. Other surfaces of 

 limbs provided with large scales, keeled except on ventral 

 surfaces of thighs, legs, and arms. Femoral pores varying 

 in number from 12 to 17j average, 14.45. About 20 to 26 

 d'jrsai scales equaling the shielded part of head. 



This lizard seems not to differ from the other sub- 

 species either in the color pattern or intensity. The amount 



