Hebius parallelum

The Yunnan keelback, Hebius parallelus (also written parallelum), is a colubrid snake first described by Boulenger in 1890 as Tropidonotus parallelus. Adults reach about 56cm in total length, including a 14cm tail. It is brown with two parallel yellowish stripes edged in black, and strongly keeled scales in 19 rows at midbody (Wikipedia, general species account).

The source lists it in Bhutan, Tibet and Yunnan, north-east India and Myanmar and does not name Nepal, so its Nepal status should be checked. It gives no habitat, diet, behaviour or breeding detail (Wikipedia, general species account).