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Second Sub-oiider. VENOMOUS COLUBRINE 



SNAKES. 



(Serpentes colubriformes venenati.) 



Snakes in which the front of the onaxillar^j is fuiniished 

 luith a short poison-fang ahuays more or less erect. 



Fam. XVIII. Elapid^e. Venomous Coluhrine Land 



Snakes. 



Land-snakes. Head normally shielded, but ^^^f^ , 



" Ophiophagus. 



no loreal. Bungarus. 



) Xenurclaps. 



Megosrophts. 

 Callophis. 



Fam. XIX. Hydrophid^e. Sea-Snakes. 

 Tail compressed into a paddle. Head-shields ^^«^»>«*- 



^ ^ -Aipysurus. 



tolerably regular, nasals generally contiguous. Disteira. 



Acalijptus. 



Ventrals narrow or none. Scales tubercular Hijdrophis. 

 and dull. Eye small ; nostrils superior. Feiamit. 



Third Sub-order. VIPERINE SNAKES. 



(Serpentes viperini.) 



Snakes with a long poison-fang, capable of complete 



depression. 



Fam. XX. Crotalid^e. Crotali or Pit-Vipers. 

 Broad thick head, very distinct from the Trimesurus. 



' *' _ Peltopelor. 



neck, and orenerally scaly or imperfectly Caiioseiasma. 

 shielded. A deep pit between the eye and the Hypnaie. 

 nostrils, corresponding to the antrum maxillo2. 



Fam. XXI. Viperid^. Vipers. 

 Broad thick head, scaly. No facial pit. e^cmI'^' 



The order in which I have arran2:ed these families differs 

 somewhat from that adopted by Glinther ; the improvement, 

 if any, is very slight, for it is difficult, especially when the 

 Indian cfenera are alone considered, to arrano^e the families 



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