Nasal divided; portion of rostral seen from above as long as its distance from tho frontal or a little shorter; suture between the internasals usually shorter than that between the prefrontals: frontal as long as its distance from the end of the snout, as long as the parietals; loreal usually longer than deep; preocular single, usually with a small subocular below, between the third and fourth labials ; one or two postoculars ; temporals 1+2; upper labials 8, fourth and fifth entering the eye, 3 or 4 lower labials in contact with the anterior chin-shields; posterior chin-shields one half or loss than one half the size of the anterior. Scales in 17 rows. ventrals 160-l8O (196); anal undivided; subcaudals 34-39. Pale brown, purplish or reddish above; markings on the head very indistinct; uniform above and below. Total length 30 inches; tail 3.
India (Assam; Arunachal Pradesh (Miao - Changlang district, Chessa, Chimpu), Bangladesh, Cambodia, Laos, Vietnam, Myanmar (= Burma), Thailand, N West Malaysia, Borneo & China (westward to Yunnan, incl. Hong Kong and Hainan),