COLUBRIN 2. 5 
6. Posterior maxillary teeth separated from the rest by an 
interspace. ‘ 
Scales with apical pits Yr. “95. Leptocalamus, IT. p. 249. 
Scales without pits...,...... 96. Arrhyton, IT. p. 251. 
D, Maxillary teeth equal or nearly so, or posterior decreasing in 
size. 
1. Scales with apical pits. 
a. Longitudinal series of scales in even numbers; eye large ; 
no suboculars.... 59. Spilotes, II. p. 23. 3.2. 
: 6. Longitudinal series of scales in odd numbers. 
a. Head distinct from neck; eye moderate or large; body 
usually much elongate. 
* Maxillary teeth nearly equal; scales forming straight 
longitudinal series. 
Nasals distinct, not fused with the loreal; ventrals rounded or more 
_ or less distinctly angulate Peal 
© dX gig G0. Coluber, IT. p. 24. 
Nasal single, fused with the loreal, in contact with the preocular ; 
ventrals sharply angulate later ally. 
61. Synchalinus, II. p. 70. °°” 
Nasals distinct; ventrals and subcaudals with a suture-like lateral 
keel and a notch on each side corresponding to the keel. 
62. Gonyophis, II. p. 70. 
** Posterior maxillary teeth decreasing in size; scales 
narrow and oblique; ventrals and subcaudals with 
a suture-like lateral keel and a notch on each side 
corresponding to the keel. 
65. Dendrelaphis, II. p. 87. 
(. Head not or but slightly distinct from neck. 
* Maxillary teeth equal or subequal. 
Snout cuneiform; rostral shield with obtuse horizontal keel. 
97. Simophis, IT. p. 253. 
Snout beak-shaped, hooked; rostral shield with sharp horizontal 
Tee fos ah, laos anal les dis 98. -Scaphiophis, II. p. 254, 
Snout obtuse or pointed ; nasal distinct from the labials. 
99. Contia, II. p. 255. “- 
Snout pointed; rostral in contact with or approaching the frontal ; 
nasal fused with the first labial. 
100. Ficimia, IT. p. 270, 
