28 SMITIISOXIAN M TSrF.LI.ANF.OT'S COLLKCTIONS VOL. C)2 



orbital semicircles harely dilTereiiliated by an occasional somewhat 

 enlarged scale; scales of the supraocular region distinctly smaller than 

 the other upper head scutes; two to four enlarged vertical canthals 

 on each side of the head ; nuchal and caudal crests widely separated 

 from the dorsal crest, which is 12 mm high (in adult males) and is 

 composed of 60 to /t, spines (average in 6 specimens, 63.5) ; nuchal 

 crest composed of 16 to 20 spines (average 17.1), the highest of which 

 measures 15 mm ; four vertical rows of small scales between the fifth 

 and sixth verticils of the tail ; eight supralabials (rarely nine) to a 

 l)oint below the center of the eye ; rostral wider than the mental ; three 

 to four enlarged tibial scales equaling the vertical diameter of the 

 tympanic membrane. 



Tvpe.—IJ.S.NM. no. 81212 (collector's number 172), an adult 

 male from Booby Cay, east of Mariguana Island, Bahamas, collected 

 on July 21, 1930. 



Description of the type. — Rostral wider than the mental and broadly 

 in contact with the nasals, which are broadly in contact with each 

 other ; a pair of slightly enlarged triangular supranasals likewise in 

 contact with each other, and lying in the angle behind the two nasals ; 

 no enlarged prefrontal, frontal or parietal scales; supraorbital semi- 

 circles barely differentiated by an occasional somewhat enlarged 

 scale ; scales of the supraocular region distinctly smaller than the 

 other upper head scutes, with a very slight indication of a supra- 

 ocular disk; occipital rather large and located well forward, sur- 

 rounded by irregular scales which are smallest behind it and a little 

 larger to the right and the left; all the scales of the head, except 

 those on the snout, keeled but not tubercular ; two or three enlarged, 

 vertical canthals on each side of the head; a well-developed series of 

 slightlv keeled supraoculars carried back a little beyond the orbit ; 

 eight upper and nine lower labials to a point directly below the center 

 of the eye ; three or four rows of small scales separating the supra- 

 labials from the suboculars ; no swollen scales in the temporal region, 

 only a few slightly enlarged and spinose scales in front of the ear. 

 and some enlarged smooth scales below the angle of the mouth: 

 about two rows of faintly keeled scales separating the infralabials 

 frona the three or four rows of more heavily keeled malar scales ; 

 dorsal scales small, ventrals slightly larger; a nuchal crest com- 

 posed of 16 spines, the longest of which measures 15 mm; a dorsal 

 crest, completely separated from both nuchal and caudal crests, com- 

 posed of 60 spines which are conspicuously uneven in basal width and 

 in height, the longest of which measures 12 mm ; the caudal crest low, 

 the highest spine only 6 mm in length, every third spine being enlarged 



