Trachischium laeve

The olive oriental slender snake is a colubrid snake found in the Indian Himalaya (western Himalayas) and Nepal. The back is uniform greyish brown, while the throat, belly, underside of the tail and first row of back scales are yellowish. The back scales are very smooth and shiny, without apical pits, in 13 rows, and males have no keels on the scales near the vent (Wikipedia, general species account).

It has 147–149 belly scales and 33–39 divided under-tail scales. The Reptile Database also lists Bhutan. The account used here gives no information on size, habitat, diet or breeding.