Smithophis bicolor

The brown trapezoid snake is a snake found in India (Assam, Meghalaya, Arunachal Pradesh at Deban and Namdapha in Changlang district), northern Myanmar and west Yunnan, China. It was formerly classified in the genus Rhabdops, but a 2019 study placed it in the new genus Smithophis (Wikipedia, general species account).

The Reptile Database also lists Mizoram and Maharashtra for India. The account used here gives no further detail.