Microtus sachalinensis Vasin, 1955 . Zool. Zh., 34:427 -431.

TYPE LOCALITY: U.S. S. R., R.S.F.S. R., Sakhalin Isl., Poronaisk Dist., Olen River .

DISTRIBUTION: Sakhalin Isl. (U.S. S.R.).

COMMENT: Subgenus Microtus; see Gromov and Polyakov, 1977:292. Related to maximowiczii of mainland Asia; see Meier, 1978, Trudy Zool. Inst., Leningr., 75:3-62, loc. cit., 79:85-90, who provided evidence of specific status.