2 COLUBRID. 
Maxillary teeth 6 to 9; scales without pits; snout cuneiform, pro- 
CRS ALD ie oS in Se 55.’ Lytorhynchus, I. p. 414. ~ 
Maxillary teeth 12 to 16; scales with apical pits. 
89. Hypsiglena, II. p. 208. 
2. Palatine and pterygoid bones toothed; pupil round; an- 
terior mandibular teeth much larger than the posterior ; 
scales with apical pits. 
a. Internasal shield entering the nostril; maxillary teeth , 
1S tp 14 fo. ik 52.°Pseudaspis, I. p. 373. f 
6. Internasal not entering the nostril. 
a. Lateral scales disposed obliquely, at least on the 
anterior part of the body; eyes large. 
Maxillary teeth 15 to 20, the posterior slightly enlarged; scales in 
PLaGO SO OWS i. . ws oe es 58. Phrynonax, II. p.18. | 
Maxillary teeth 20 to 32, the posterior strongly enlarged; scales in 
MeO) TSIMEOWS © nar .ce «comes 71. Leptophis, II. p. 105. ¢4.°* 
(3. Scales forming longitudinal series ; maxillary teeth 11 
to 20 
Posterior maxillary teeth strongly enlarged and separated from the 
rest by an interspace; scales narrow, lanceolate. 
72. Uromacer, II. B 15, 
Posterior maxillary teeth slightly enlarged. 
73. Hypsirhynchus, II. “RY GAD. 
Posterior maxillary teeth strongly enlarged and separated from the 
rest by an interspace; scales moderately elongate. 
74. Dromicus, II. p.118. 
3. Palatine and pterygoid bones toothed; pupil round ; man- 
dibular teeth subequal, or anterior a little enlarged. 
a. Longitudinal series of scales in even numbers ; maxillary 
teeth 20 to 33. 
Scales forming longitudinal series. 
53. Zaocys, I. p. 374. 
Lateral scales oblique........ 63. Herpetodryas, II. p. 71.5" - 
b. Longitudinal series of scales in odd numbers; ventrals 
rounded or obtusely angulate laterally ; subcaudals not 
angulate laterally. 
a. Maxillary teeth forming a continuous series, or the 
last two or three separated from the rest by a very 
short interspace. 
