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Green dorsal side Pale green ventral side brick red tail ,pit in between eye and nose.
Arborial -Jungle of Sundarban
Gosoba-WB-India
White-lipped was my first thought, too, but it seems to look more like Trimeresurus erythrurus, due to the yellow being more prominent on the face than any white.
http://www.treknature.com/gallery/Asia/I...
This is a species of pit viper, Trimeresurus spp. It may be the White-lipped Pit Viper - Trimeresurus albolabris
http://www.indiansnakes.org/Snakedatabas...