198 3. IGUANIDM 



more or less regular rows of larger scales of which the inter- 

 nal row is most regular and composed of largest scales. 

 Scales of all these rows may be either keeled or smooth. 

 Other dorsal scales very small except a more or less distinct 

 row of sometimes widely-separated enlarged scales on pos- 

 terior portion of upper of two lateral longitudinal dermal 

 folds. Tail bearing whorls of strongly or weakly keeled 

 scales, some of which are shortly mucronate. Caudals much 

 broader above than below. 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 smooth scales. Ventral scales smooth and about 

 size of those on edge of gular fold. Femoral pores varying 

 from 10 to 13 in number on each thigh. Ten to 17 of 

 largest dorsal scales equaling length of shielded part of 

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

 with enlarged postanal plates. 



The general color above is grayish blue, blue, or grayish 

 or yellowish brown, or almost black, clearer on the head and 

 the base of the tail, darkest along the sides of the body 

 where crossed by from six to eight more or less definite bars 

 of black or brown. These cross-bars are often very indis- 

 tinct, usually interrupted on the middle of the back, and 

 sometimes alternating with those on the opposite side. They 

 sometimes have light edgings of blue. The sides are often 

 dotted or marbled with blue and brown or black. The tail 

 is not distinctly ringed; it is blue or brown, unicolor or 

 marbled with blackish brown. The lower surfaces are blue, 

 varying from sky blue to indigo, more or less dotted or 

 suffused with dark brown or black. In very light specimens 

 the chest and lower surfaces of limbs and tail may be gray. 

 There seems to be no sexual difference in color. 



