Hebius modestus, commonly known as the modest keelback or Günther's keelback, is a species of natricine snake endemic to Asia.
It is found in Burma, Cambodia, China (especially Guangdong, Guizhou, and Yunnan), India (particularly Assam, Meghalaya), northern Laos, Thailand, and Vietnam.
Adults may attain 60 cm (2 feet) in overall length; tail length 18 cm (7 inches).
Dorsally the modest keelback is olive brown with small black spots. It has a series of small yellowish spots, or a yellowish stripe, along each side of its back. The labial sutures are black. Ventrally it may be yellowish with a series of blackish spots on each side of the ventrals, or yellowish in the middle and blackish on the sides, or almost entirely blackish.
The dorsal scales are in 19 rows, weakly keeled. Ventrals 154-168; anal divided; subcaudals 96-122, also divided.[1]
In India this species is found in forests at altitudes of 600-1,500 m (approximately 2,000-5,000 feet).[2]