THE HERPETOLOGY OF HISPANIOLA 129 



a 2 . Dorsal scales juxtaposed or imbricated. 



b l . Dorsal scales enlarged, flat, keeled, and imbricate on midline, 

 very much like ventrals. 

 c 1 . Scales of gular fan relatively fine, skin between them 



light semilineatus (P- 133) 



c 2 . Scales of gular fan coarse, interstitial skin usually dark olssoni (p. 137) 



b 2 . Dorsal scales (all or except two rows on median line) gran- 

 ular or tubercular, differing but little, if at all, from laterals, 

 but very much from ventrals, which are larger. 

 c 1 . A fairly regular median paired series of scales on upper an- 

 terior part of snout; usually two or more supraorbital 

 scales fully in contact with their fellows (distichus group). 

 d 1 . A distinct preoccipital scale nearly as large as occipital 

 usually present. 

 e 1 . Tail with well-marked verticils, every ninth vertical 

 row consisting of enlarged, elongate, pointed scales, 

 intervening rows of scales smaller, the whole sur- 

 mounted by a strongly serrate caudal crest with 5 

 triangular scales, the fourth the largest and the first 

 the smallest, corresponding to a verticil 



distichus do minicensis (p. 141) 

 e 2 . Tail with very indistinct verticils, every eleventh or 

 twelfth row of scales more vertical but not enlarged, 

 intervening scales in curving or irregular rows, 

 whole surmounted by a weakly serrate caudal crest 

 with 5 triangular scales to a verticil, the first and 



fifth quite small, the others subequal distichus juliae (p. 148) 



d 2 . Preoccipital usually broken up into a number of smaller 

 scales, or absent. 

 e 1 . No spots or stripes on body; color reddish brown 



distichus altavelensis (p. 151) 

 e 2 . Spots or stripes present; ground color grayish. 

 f l . Four small round black spots usually present in a 



transverse row behind occipital distichus wetmorei (p. 154) 



P. A black shoulder patch bordered above and below by 



parallel light stripes. distichus caudalis (p. 156) 



c 2 . Median snout scales not in a paired series on snout; not 



more than two paired supraorbital scales (sometimes 



none) in contact with their fellows on midline. 



d 1 . Head short and broad, body stout, limbs heavy (cybotes 



group) . 



e 1 . Tail scales relatively finer, usually 6 to 9 vertical rows 



of scales to every verticil; snout generally more blunt. 



p. Belly scales relatively coarse, median dorsals small; 



heel not reaching beyond shoulder when hindlimb 



is adpressed cybotes cybotes (p. 159) 



P. Belly scales quite small, median dorsals longer than 

 in preceding form; heel reaching nearly to posterior 



border of ear cybotes longitibialis (p. 164) 



e 2 . Tail scales relatively coarser, usually 4 to 6 vertical rows 



to a verticil; snout generally more elongate.cybotes doris (p. 167) 



