204 3. IGUANIDM 



small except a row of widely-separated enlarged scales on 

 upper or dorsolateral longitudinal dermal fold, sometimes 

 becoming continuous series posteriorly. Sometimes a few 

 enlarged scales on lower or lateral fold. A number of 

 more or less well-developed oblique groups of enlarged 

 granules or tubercles between these two folds. A group of 

 large tubercles on dorsolateral fold of neck. Tail bearing 

 whorls of strongly keeled and sharply pointed scales, which 

 are much broader above than below j about every third 

 whorl larger. Posterior surfaces of thighs and arms 

 covered with small granules similar to those on sides of 

 body. Superior and anterior surfaces of limbs provided 

 with large, keeled scales. Ventral scales smooth and about 

 size of those on gular fold. Femoral pores varying from 

 nine to 16 in number on each thigh. Ten to 16 of largest 

 dorsal scales equaling length of shielded part head. Tail 

 less than twice as long as head and body. Males with 

 enlarged postanal plates. 



The general color above is grayish or yellowish brown, 

 paler and somewhat ochraceous on the head and the base 

 of the tail, darkest along the upper lateral fold, and crossed 

 by from six to eight light-edged bars of black or brown. 

 These cross-bars are often very indistinct, usually inter- 

 rupted on the middle of the back, and sometimes alterna- 

 ting with those on the opposite side. The light edgings 

 of the dorsal bars may be either blue or yellow. The sides 

 are often dotted with one or both of these colors. Narrow 

 dark lines cross the top of the head, the most distinct being 

 on the supraocular and frontal regions. In the young the 

 dark coloring of the upper lateral fold is continued forward 

 as a line, passing just above the ear-opening, crossing the 

 orbit, and ending at the nostril. The tail is indistinctly 

 ringed with dusky and often tinged with ochraceous. The 

 lower surfaces are white, more or less dotted or suffused 



