Hump-nosed Pit Viper
Scales smooth or weakly keeled, Triangular head dinstinctly broader than neck. Small tail, Body Light brown to Chocolate brown. Top head brown separated from black side of head by a distinct pale yellow or white line. Tail tip yellowish/reddish brown. Common name is misleading as the snout is turned up very slightly.
Merrem's Hump-nosed Pit Viper