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Second Sub-ordek. VENOMOUS COLUBRINE 

 SNAKES. 



(Serpentes colubriformes venenati.) 

 Snakes in which the front of the maxillary is furnished 

 with a short poison-fang always more or less erect. 



Fam,. XVIII. ELAPiDiE. Venomous Colubrine Land 



Snakes. 

 Land-snakes. Head normally shielded, but ^"s^- , 



•' Ophtophagus. 



no loreal. Bungarut. 



Xenurelaps. 

 Megarophis. 

 Callophii. 



Fam. XIX. Htdrophid^. Sea-^Snakes. 

 Tail compressed into a paddle. Head-shields Piaturm. 

 tolerably regular, nasals generally contiguous. JDisteira. 



*' =■ ° Acalyptu). 



Ventrals narrow or none. Scales tubercular Sydrophu. 



_ ,, , ., . Mnhydrina. 



and dull. Eye small ; nostrils superior. PeicmU. 



Thikd Scb-okder. VIPERINE SNAKES. 



(Serpentes viperini.) 



Snakes with a. long poison-fang, capable of complete 



depression. 



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

 Broad thick head, very distinct from the |;«»«™'-«»- 

 neck, and generally scaly or imperfectly Caiioseiasma. 

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

 nostras, corresponding to the antrum, maxill(B. 



Fam. XXI. Viperid^. Vipers. 

 Broad thick head, scaly. No fapial pit. |«*^»- 



The order in which I have arranged these families differs 

 somewhat from that adopted by Giinther ; the improvement, 

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

 Indian genera are alone considered, to arrange the families 



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