Pareas andersonii

Anderson's slug snake is a small, non-venomous snake found in India (Nagaland and Mizoram), northern Myanmar and China (Yunnan). It is mostly dark grey with a bluish sheen, with vertical black and white stripes on the back and sides that lose their form towards the rear and become random speckling. The top of the head is dark grey with many black spots and no neck spot or collar (Wikipedia, general species account).

The sides of the head have dense white mottling, and the underside is white or beige with many black rectangular spots across the belly scales. Like others in its genus, it is a semi-arboreal, nocturnal snake that primarily preys on land snails and slugs.