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The Family Viperidæ is represented in Asia by a considerable number of snakes belonging to the two Subfamilies Viperinæ and Crotalinæ.

The Asiatic Viperinæ belong to the genera:—

(a) Vipera. (b) Pseudocerastes. (c) Cerastes. (d) Echis.

The Crotalinæ consist of only two genera:—

(e) Ancistrodon. (f) Lachesis.