186 BULLETIN 17 7, UNITED STATES NATIONAL MUSEUM 



the throat, that is directly behind the mentals, about twice as 

 long as wide, about two or three times as long as the more posterior 

 throat scales. No dewlap. Upper surface of the fore limbs covered 

 with imbricate keeled scales; under surface of the forearms with 

 smooth scales of approximately the same size; under surface of the 

 upper arm covered with granules; pre-axial surface of the upper leg 

 covered with large scales which are keeled on the upper surface of the 

 limb and smooth on the ventral surface ; post-axial surfaces of the upper 

 limb covered with granules; lower leg covered with small keeled scales 

 above and much larger smooth or slightly keeled scales on the ventral 

 surface. Digits of fore limb with relatively smaller enlargements 

 than occur in the hind limb; seventeen lamellae imder the fourth 

 finger; thirty-four lamellae under the fourth toe. Tail very slender, 

 approximately two and one-half times as long as the distance from 

 snout to vent; tail only slightly compressed and with a barely differ- 

 entiated crest; in the center section of the tail the scales on this crest 

 only one-third to one-fourth larger than the scales on the side; about 

 six vertical scale-rows on the side of the tail between one cleavage 

 groove and the next; two enlarged post-anal plates. 



"Ground tone of the dorsal surface (in alcohol) a slate gray; four 

 broad bars of reddish brown extending across the back between the 

 fore and hind limbs, each bar edged with very dark brown; an oval 

 spot of gray marking each cross-bar at its intersection of the mid- 

 dorsal line ; the lower sides of the body dark brown spotted with gray 

 or white; some ill-defined grayish spots on the neck and back of the 

 head, the most conspicuous of these forming a semicircular bar behind 

 the orbit; upper and lower eyelids white; legs and tail brownish 

 gray above and on the sides feebly cross-barred or blotched dark 

 brown and white; ventral surface of the throat and abdomen white 

 suffused with gray on the lower jaw and posterior part of the throat; 

 under surfaces of the appendages white tinged with brown, especially 

 on the posterior limbs. 



"Dimensions. — Head and body, 46.5 mm.; tail, 113.5 mm.; snout 

 to posterior edge of ear, 15.5 mm.; snout to center of eye, 10.5 mm.; 

 width of head, 8 mm.; foreleg to base of toes, 14 mm.; hindleg to. base 

 of third and fourth toe, 29 mm. 



"Variation. — The seventy-five paratypes (A.M.N.H. Nos. 51081- 

 127, 51129-56) show marked sexual dichromatism. Thirty-four are 

 males, thirty-nine are females, and two are sexually immature. The 

 males are uniformly cross-barred but the females show variations of a 

 longitudinal striping or an approach toward the cross-bars but never 

 the complete broad saddles of the males. In some of the males these 

 cross-bars are not interrupted on the mid-dorsal line as in the type. 

 The females are more uniformly brown in tone and in life do not show 

 the vivid green of the males. In some females the junction of the 



