34-6 3. IGUANIDM 



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

 interparietal plate to a line connecting posterior surfaces of 

 thighs varying from 28 to 31 j average in nine specimens, 

 29.5. IMales with enlarged postanal plates. 



The color above, in adult males, is yellowish brown, 

 becoming browner on the hind limbs and base of the tail. 

 A few of the scales on the back are marked with greenish 

 blue in varying amount. The scales on the base of the tail 

 are not spotted but those on the hind limbs often are marked 

 centrally with yellowish or bluish gray. The scales on the 

 base of the tail usually are edged with yellow. There is no 

 well developed longitudinal light streak along the middle of 

 the back but this region is lighter than the rest of the body. 

 There is no dorsolateral longitudinal light band, even on 

 the neck. The sides of the body are bluish or grayish with 

 more or less parallel narrow dark lines running in the direc- 

 tion of the keels of the lateral scales. These lines are formed 

 by from one to three dark brown or blackish lines on each 

 scale. The central area of each lateral scale is bluish or 

 grayish. The top of the head is brownish olive, usually 

 without markings. There is a large black blotch or collar in 

 front of the shoulder, sometimes indistinctly edged behind 

 and in front with pale blue or greenish yellow. There is 

 a similar but smaller black blotch on the anterior and ven- 

 tral surfaces of the thigh and side of the body. These two 

 black blotches may be connected by a black streak along the 

 belly just external to a median longitudinal stripe of yellow- 

 ish white, but in most specimens the entire median portion 

 of the belly is black. This black ventral area extends for- 

 ward onto the chest, where it is more or less tinted with, 

 or replaced by, spots of greenish blue. The central gular 

 region is blackish indigo, while on the chin and anterior 

 gular region the scales are lighter indigo with lighter blue 

 centers which may form parallel longitudinal blue lines 



