THE HERPETOLOGY OF HISPANIOLA 129 



. Dorsal scales juxtaposed or imbricated. 



bK Dorsal scales enlarged, flat, keeled, and imbricate on midline, 

 very much like ventrals. 

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



light semilineatus (p. 133) 



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



6^. 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'. 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 {distichtis group), 

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

 usually present, 

 gi. 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 dominicensis (p. 141) 

 e*. 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) 



cP. Preoccipital usually broken up into a number of smaller 

 scales, or absent, 

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



distichus altavelensis (p. 151) 

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

 /'. 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^. 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^. Head short and broad, body stout, limbs heavy (cybotes 



group). 



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



of scales to every verticil ; snout generally more blunt. 



/'. BeUy 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*. Tail scales relatively coarser, usually 4 to 6 vertical rows 



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



