296 3. IGUANID.^ 



on sides similar to those on back, but a little smaller and 

 and directed obliquely upward. No longitudinal dermal 

 folds, and no transverse fold across throat. Upper sur- 

 faces of limbs provided with large, keeled scales. Posterior 

 surface of thigh with small, acuminate, keeled scales. Ven- 

 tral scales much smaller than dorsals, smooth, imbricate, 

 and often bicuspid. Tail furnished with irregular whorls 

 of strongly keeled and pointed scales, much larger and 

 rougher above than dorsals and inferior caudals. Femoral 

 pores varying in number from 16 to 22 on each thigh; 

 average, 18.7. Eight to 13 dorsal scales equaling length 

 of shielded part of head. Number of scales in a row from 

 the interparietal plate to a line connecting posterior sur- 

 faces of thighs varying from 44 to Si; average in 50 speci- 

 mens, 47.3. Males with enlarged postanal plates. 



The color above is yellowish, brownish, grayish, or 

 greenish olive, usually with rather indistinct and very nar- 

 row undulate dark brown cross-bands. These dark mark- 

 ings occasionally are distinct and continuous, but usually 

 are more or less broken up or obsolete. The sides in 

 many specimens are colored like the back. Others have a 

 more or less definite dark brown longitudinal band run- 

 ning from the shoulder to the hind leg. The head, above, 

 is yellowish brown or olive, unicolor or with dark brown 

 lines and dots. Narrow dark brown lines often run from 

 the nostril to the eye, from the eye to the upper end of the 

 car-opening, and from the latter point to the shoulder. The 

 upper surfaces of the limbs and tail are yellowish brown or 

 olive, unicolor or more or less definitely dotted or cross- 

 barred with dark brown. The lower surfaces are yellowish 

 white with a bright blue spot on each side of the throat and 

 an elongated blue patch on each side of the belly in both 

 sexes. 



