60 



COLUBRID^. 



Kg. 5. 



Skull of Dipsadomorphus cynodon. 



Synopsis of the Species. 

 I. Anterior palatine teetli not or but feebly enlarged. 

 A. Snout longer than the eye. 



1. PrEBOcular not extending to upper surface of head; scales 



in 17 to 21 rows ; ventrals 202-250. 



Scales in 21 rows, vertebrals feebly 



enlarged ; subcaudals 76-92 1. trigonattis, p. 62. 



Scales in 17 or 19 rows, vertebrals 



strongly enlarged ; subcaudals 80- 



106 2. muUimaculatus, p. 63. 



Scales in 21 rows, vertebrals strongly 



enlarged ; subcaudals 87-94 3. goJcool, p. 64. 



Scales in 19 or 21 rows, vertebrals 



strongly enlarged ; subcaudals 94- 



140 4. hexagonotus, p. 65. 



2. Prseocular extending to upper surface of head ; scales in 19 



to 23 rows ; ventrals 209-272. 



a. Posterior chin-shields larger than the anterior ; scales in 

 19 or 21 rows ; ventrals 214-268. 



