Dipsas indica Big-headed Snail-eating Snake
Some other names for this species:
Neotropical Snail-eater, Amazonian Snail-eater
Subspecies I've seen:
D. i. indica
Big-headed Snail-eating Snake
Dipsas indica indica Big-headed Snail-eating Snake
Santa Cruz Forest Reserve, Loreto, PeruJanuary 19, 2014
Big-headed Snail-eating Snake (Dipsas indica indica)
Finding this sleeping snake was one of my proudest moments in herping, since I saw it before either of the two local staff and herp-finding masters Edvin and Cesar did, and we were all looking in the same area. I slept soundly that night.

Here is a complete list of the herps I saw in the wild on my 2014 MT Amazon Expeditions trip.

Online references:
Printed references: