HERPETOLOGY OF PORTO RICO. 673 



the nasals; one large keeled eanthal scale nearest tlie orbit, the anterior 

 ones but slightly developed; a well- developed series of strongly keeled 

 siiboculars continued backward as a suprat3'nipanic series to above the 

 ear; ten supi'ala])ials, the suture between the last two under the center 

 of the eye; a series of small scales separating tlie subocuUirs and the 

 supralabials; a))ove the angle of the mouth and in fi'ont of the lower 

 edge of the ear a hirge tubercular shield and abovi^ it about the middle 

 of the front edge of the ear another shield, convex and almost as large; 

 tympanum elliptical, erect, large; eleven lower lal)ials to the center of 

 the eye; a series of enlarged malai* scales, the posterior ones strongly 

 keeled and separated from the lower la])ials )>y several rows of small 

 scales; dorsal and ventral scales small, a})out eleven contained in the 

 vertical diameter of the tympanum, rhoml)oidal, ol)li([uely keeled, the 

 keels pointing toward the median line; from the occiput along the 

 median line of the neck and back a series of enlarged strongly keeled 

 scales forming a low serrated crest, Avhich is much reduced between the 

 shoulders, absolutely interrupted on the rump, and <'onse<iuently not 

 continuous with the caudal crest; length of the crest scales on the 

 middle of the back three to the vertical diameter of the tympanum, 

 51 in the dorsal crest from shoulder to rump; throat covered with 

 scales similar to the ventrals ]>ut smaller; sides and luiderside of neck 

 with numerous folds, a large median one almost lai'ge enough to be 

 called a dewlap, joining posteriorly a strong transverse fold; upper 

 surface of limbs with slightly imbricated, keeled, posteriorly pointed 

 scales, somewhat larger than the dorsals, on the lower arm about seven, 

 on the tibia about four to the vertical diameter of the tympanum; a 

 single series of aliout eighteen femoral pores; inner side of second toe 

 with one " com)),'' of third toe with two ''combs" (see tig, 125); tail 

 compressed, covered with o])liquely keeled scales in vertical rows 

 forming faintly indicated verticils, al)out four rows of the larger 

 scales to a verticil; tail surmounted by a crest of enlarged, pointed 

 triangular scales forming a strongly serrated edge. 



lyuiu'tiaionfi. 



mm. 



Total length 456 



Tip of snout to vent 176 



Vent to tip of tail 280 



Tip of 8nout to ear 37 



Width of head 28 



Fore limb 70 



Hind limb 125 



Vertical diameter of tympanum 8 



Variation. — I have described purposely a young specimen, partly 



because it is the best preserved one in our collection, but mostly 



because the young show the individual scales and shields better than 



the older ones. In these, from age and excessive wear, and also because 



NAT MUS 1902 43 



