THE HERPETOLOGY OF HISPANIOLA 203 



L. vinculum has the sides of the head no darker than the body itself. 

 Instead it has a rather characteristic throat pattern of longitudinal 

 dark lines. 



The dwarf species semilineatus is separable from all the others at 

 once on its small adult size alone. The short hindleg of scalaris, as 

 well as its unusually bristling appearance, distinguishes it from the 

 more slender and sleek subspecies. 



L. lunatus is somewhat like mentalis in having the mental shield 

 edged with sepia but differs from the latter in other details of colora- 

 tion; lunatus is rather more similar to louisae from the island of Saona 

 in its dorsal coloration, although the Saona Island form does not have 

 the black crescentic shoulder markings that sometimes appear in 

 adult males from the neighboring mainland. 



The swollen nose of adult males of aureus suggests the similar 

 phenomenon fomid in personatus personatus, its neighbor on the west, 

 but in dorsal and ventral coloration it strongly suggests the Beata 

 Island form, beatanus. 



Although the number of subspecies of the personatus group occurring 

 on Hispaniola and its neighboring islets is now brought up to 1 1 , it is 

 safe to predict the eventual discovery of still others in more or less 

 segregated areas where little collecting has been done. The colora- 

 tion of the adult males appears to be the most conspicuous of the 

 characters separating them. Other good characters appear in the 

 number of the dorsal scales, the size of the parietals, and the relative 

 proportion of the hindleg to body length. 



KEY TO LEIOCEPHALUS OF HISPANIOLA AND ADJOINING ISLETS 



a 1 . A distinct lateral fold; 4 scales between rostral and supraocular 

 ring. 

 6 1 . Sides of neck behind ear covered with small, sharply granular 



scales; body scales relatively very small schreibersii (p. 204) 



b 2 . Sides of neck behind ear covered with scales keeled and im- 

 bricated like dorsals; body scales relatively large, melanochlorus (p. 209) 

 a 7 . No lateral fold; 3 scales between rostral and supraocular ring 

 (personatus group). 

 6 1 . Frontals and prefrontals smooth. 



c 1 . Frontals usually in contact with canthals; throat 



immaculate personatus semilineatus (p. 217) 



c 2 . Frontals usually separated from canthals by a wedge-shaped 

 scale; throat not immaculate. 

 d 1 . Upper surface of head not conspicuously spotted. 



e 1 . Throat and chin heavily spotted with dark brown in 

 adult male; venter greenish gray; outer parietals 



twice as broad as inner ones p. barahonensis (p. 219) 



e 2 . Throat with a series of about 4 regular transverse rows 

 of spots running across it, the posterior ones con- 

 tinued as stripes onto labials and nearly to upper 

 part of head; under surfaces of legs and tail gamboge 

 yellow; outer parietals 3 times as broad as inner 

 ones p. aureus (p. 223) 



