Assam Mountain Snake

The Assam mountain snake (Plagiopholis nuchalis) is a small colubrid found in Yunnan in China, Laos, Myanmar and Thailand, and possibly in Assam and Vietnam. The Reptile Database gives elevations of 900–1,620 m. (The Reptile Database; Wikipedia, general species account)

It may reach about 45 cm in total length. It is blackish brown above, with many scales edged in black, and has a broad black forward-pointing chevron on the neck that gives the species its name. The belly is yellowish with black markings, and the species is oviparous. (Wikipedia, general species account)