Fowlea sanctijohannis
Habitat
Freshwater wetlands at about 960-2,200m
Range
Bhutan, northern India, northern Myanmar, Nepal and Pakistan
St. John's keelback, Fowlea sanctijohannis, is a colubrid snake first described by Boulenger in 1890 as Tropidonotus sancti-johannis and named for the British naturalist Oliver Beauchamp Coventry St. John. It is found in Bhutan, northern India, northern Myanmar, Nepal and Pakistan, preferring freshwater wetlands at about 960 to 2,200m. It lays eggs (Wikipedia, general species account).
The source gives no size, appearance, diet or behaviour detail (Wikipedia, general species account).