Achalinus niger Bourret, 1935 nec Maki, 1931 Achalinus ater, commonly known as Bourret's odd-scaled snake, is a species of snake in the family Xenodermatidae.

The species is found in northern Vietnam and China in Guizhou and Guangxi.

[1][2] An individual found in Hecheng District, Huaihua during early May 2013 was originally reported as the first known occurrence of the species in Hunan Province.

[3] However, molecular analysis has found this specimen to be a separate species named Achalinus hunanensis in 2023, and A. ater is no longer believed to range into Hunan.

[4]