Oligodon melaneus

The bluebelly kukri snake is endemic to eastern India. It was described in 1909 by Frank Wall from two specimens from Tindharia, Darjeeling. One was a female about 30 cm in total length, with a 4 cm tail, carrying four eggs, and the other a male of similar length (Wikipedia, general species account).

The body is uniformly black above, grading to greyish on the flanks, and the belly is blue-grey, with black speckling in the female.