Dicrostonyx exsul G. M. Allen, 1919 . Bull. Mus. Comp. Zool. Harv. Univ., 62:532.

TYPE LOCALITY: U.S.A., Alaska, Bering Sea, St. Lawrence Isl .

DISTRIBUTION: Known only from the type locality.

COMMENT: Female diploid number is 34; fundamental number is 54. Formerly included in torquatus; see Rausch, 1977, in Sokolov, ed., [Adv. Mod. Theriol.], Acad. Sci. U.S. S.R., Nauka, Moscow, pp. 162- 177.