30 . COLUBRID. 
D. Solid maxillary teeth unequal, the middle ones the longest. 
1. Solid maxillary teeth forming an uninterrupted series ; 
pupil round. 
Maxillary teeth 10 or 11, gradually decreasing in size in front and 
PO cee en hns Sea re as 6 169. Dromophis, p. 149. 
Maxillary teeth 14, middle ones much enlarged. 
170. Taphrometopon, p. 151. 
2. Longest solid maxillary teeth followed by a gap. 
a. Pupil round; scales with apical pits. 
Loreal in contact with the preocular. 
171. Psammophis, p. 152. 
Loreal separated from the preocular by the prefrontal. 
172. Mimophis, p. 171. 
b. Pupil vertically subelliptic. 
Eye rather large ; scales without apical pits. 
173. Psammodynastes, p. 172. 
Eye rather small; scales with apical pits. 
174, Macroprotodon, p. 175. 
c. Pupil horizontal ; scales very oblique, with apical pits. 
175. Dryophis, p. 177. 
E. Solid maxillary teeth subequal or increasing in Jength to 
the last; head not or but slightly distinct- from neck ; 
pupil round; scales without apical pits. 
1, Subcaudals in two rows. 
a. Solid maxillary teeth 10 to 15, the grooved fangs 
below or just behind the vertical of the posterior 
border of the eye. 
a. Grooyed maxillary teeth very large; anterior 
mandibular teeth longest. 
161. Conophis, p. 122. 
f. Grooved maxillary teeth feebly or moderately 
enlarged; mandibular teeth equal. 
* Internasals distinct from nasals; two prefrontals. 
+ Loreal present. 
Eye moderate ; tail moderate or long; nostril between two nasals, 
181. Erythrolamprus, p. 199. 
Eye small; tail moderate ; nasal entire or semidivided. 
182. Hydrocalamus, p. 209. 
Kye small; tail short; nostril between two nasals. 
183. Scolecophis, p. 210. 
