HERPETOLOGY OF PORTO RICO. 667 



than the ear-opening, separated from the supraocular semicircles by 

 one row of flat scales; supraocular disk consisting of five or six polyg- 

 onal keeled shields conspicuously larger than the surrounding scales, 

 which are also keeled, and of which one row separates the disk from 

 the semicircle; two scales in front of the supraocular scales between 

 the superciliaries and the supraocular semicircle; canthus rostralis 

 consisting of four elongate narrow shields, the first one very small, 

 the third longest; the superciliary ridge consisting of an anterior long 

 and narrow shield and a series of scales contrasting in size with the 

 granules surrounding the eye, but not with the small scales of the 

 supraorbital region; loreal rows three or four; subocular semicircle 

 keeled, broadly in contact with the supralabials, not bending upward 

 behind the orbit; supralabials seven, the suture between fifth and 

 sixth being under the center of the eye; central temporals large gran- 

 ules; a well-developed double row of scales forming a supratemporal 

 line; dorsal scales rhomboidal, imbricate, sharply keeled, the keels 

 forming continuous parallel ridges, large, much larger than the lat- 

 erals and nearly as large as the ventrals; laterals similar to the dorsals, 

 but much smaller and less sharply keeled; ventrals like the dorsals, 

 only more pointed and slightly larger; scales on throat and chin simi- 

 lar, keeled, only considerably smaller, though larger than the laterals; 

 arms and legs covered with similar imbricated, keeled scales nearly 

 as large as the ventrals; hands and feet above with pluricarinate scales; 

 digits long and slender, expansion moderate; 18 lamellae under pha- 

 langes ii and iii of fourth toe; tail veiy long, more than twice head 

 and body, moderately compressed, covered with large keeled scales 

 forming continuous ridges, with scarcely any indications of verticilla- 

 tion, the upper edge being but faintly serrated; dewlap entirely cov- 

 ered with imbricated, pointed, and keeled scales nearly as large as 

 the ventrals, edge not thickened; postanal plates very small. 



Dimensions. 



mm. 



Total length ( tail defective) 



Tip of snout to vent 43 



Vent to tip of tail (tail defective) 



Tip of snout to ear 12. 5 



Width of head 7 



Fore leg 17 



Hind leg 31 



A young female without dewlap and postanal plates (No. 27290) 

 measured as follows: 



mm. 



Total length 116 



Tip of snout to vent 34 



Vent to tip of tail 82 



