DIPSADOMOEPHIlfiE. 29 



tt Maxillary teeth 9 or 10, increasing in length ; 

 anterior mandibular teeth strongly enlarged ; 

 eye small . 158. Hemirhagerrhis, p. 119. 



** Scales without pits ; maxillary teeth 15, equal ; 

 anterior mandibular teeth strongly enlarged. 

 159. Manolepis, p. 120. 



C. Solid maxillary teeth subequal or increasing in length to 

 the last ; head more or less distinct from neck ; pupil 

 round or horizontal ; scales with apical pits. 



1. Solid maxillary teeth 10 or more, separated from the 



grooved fangs by an interlpace. 



a. Pupil round. 



a. Anterior mandibular teeth not .enlarged ; nasal 

 entire or semidivided. 



MaxUlary teeth gradually increasing in size. 



162. AmplorMnus, p. 124. 



Maxillary teeth equal 163. Pseudablabes, p. 126. <^ 



(3. Anterior mandibular teeth enlarged. 

 Maxillary teeth subequal ; scales more or less oblique ; nostril 



between two nasals 164. PMlodryas, p. 127. - 



Last solid maxillary tooth very large, fang-like. 



165. laltris, p. 137. 



Maxillary teeth subequal ; nostril between two nasals and the inter- 

 nasal 166. Trimerorhinus, p. 138. 



Maxillary teeth subequal ; nostril in a single or divided nasal ; 

 scales more or less distinctly grooved. 



167. Coelopeltis, p. 141. 



b. Pupil horizontal ; scales very oblique ; body compressed. 



176. Thelotomis, p. 184. 



2. Solid maxillary teeth 17jto_20, not separated from the 



grooved fangs, which are feebly enlarged; scales more 

 or less oblique ; body compressed. 



Ventrals rounded ; pupil round . 178. Oxybelis, p. 189. 



Ventrals and subcaudals with suture-like lateral keel ; pupil 

 horizontal 179. Dryophiops, p. 193. 



Ventrals and subcaudals with suture-like lateral keel ; pupil round. 



180. Chrysopelea, p. 195. 



3. Solid maxillary teeth 4 to 9 ; grooved fangs very large. 

 Eye large ; scales oblique 160. Tomodon, p. 120. ^ 



Eye moderate ; scales forming straight longitudinal series. 



168. Rhamphiophis, p. 144. 



Eye extremely large ; scales very oblique. 



177. Dispholidus, p. 186. 



