Blackbelly worm-eating snake, Darjeeling slender snake
As the common name implies, the venter is black or dark brown. The dorsum is also black or dark brown, and may have lighter longitudinal streaks. The dorsal scales are in 13 rows. Males have keeled scales on their sides in the anal region. Adults may attain 51 cm (20 inches) in total length, with a tail 6 cm (2¼ inches) long.