HERPETOLOGY OF POBTO RICO. 657 



consisting of about nine keeled, polygonal scales separated from the 

 semicircle by one vow of minute scales; two or three scales in front 

 of the supraocular granules between the superciliaries and the supra- 

 ocular semicircle; canthus rostralis consisting of four narrow, elon- 

 gated scales, second and third longest; superciliary ridge consisting of 

 one very long and narrow anterior shield followed by a double series 

 of scales which separate the supraocular granules from those surround- 

 ing the eye; loreal rows, seven; subocular semicircle keeled, broadly in 

 contact with supralabials; eight supralabials, keeled, the suture between 

 sixth and seventh under center of eye; temporals granular in center 

 with a slightly ( ley eloped supratemporal line; about six median dorsal 

 rows of scales flat and keeled, imbricated, like the ventrals, though 

 smaller than these, the rest of the back and the sides covered by 

 minute granules; ventral scales large, imbricate, strongly keeled, the 

 keels forming continuous ridges, those on throat much smaller and 

 narrower, also keeled; legs covered by keeled scales, those on upper 

 surface of arms and on anterior aspect of femur larger, equaling or 

 exceeding the ventrals; scales on upper surface of digits pluricarinate; 

 digits, especially toes, very long and slender, the expansion moderate; 

 about 20 lamella? under phalanges ii and iii of fourth toe; tail very 

 long, more than twice the length of head and body, moderately com- 

 pressed and covered by large, subequal, keeled scales, with scarcely 

 anv indication of verticils, and the median series above forming a but 

 slightly enlarged and feebly serrated edge; dewlap naked with distant 

 series of scales, the edge thickened; postanal plates very slightly 

 developed. 



Dermal folds on nape and back very strongly de\ T eloped in life, as 

 shown on frontispiece. 



Dimensions. 



in hi . 



T< >tal length L55 



Tip of snout to vent !•"> 



Vent to tip of tail 110 



Tip of snout to ear 14 



Width of head 85 



Fi >re leg - -1 



Hind leg 40 



The females have merely an indication of a dewlap and a nuchal 

 fold; they also lack postanal plates. The young are devoid of the 

 dermal folds. 



Va/riation. — There is a variation in thescutellation similar to that in all 

 the other species, though perhaps of less importance in this species, as 

 its differences from the nearest allies are to be found more pronounced 

 in other features. Thus there is one single row separating- the supra- 

 ocular semicircles as often as two, and there is considerable variation 

 in the number of rows on the loreal triangle (live to seven), of supra- 

 nat MUS 1U02 42 



