Dicrostonyx nelsoni Merriam, 1900. Proc. Wash. Acad. Sci., 2:25.

TYPE LOCALITY: U.S.A., Alaska, Norton Sound, St. Michael.

DISTRIBUTION: W. coastal Alaska and Alaska Peninsula.

COMMENT: Tentatively includes peninsulae; see Youngman, 1975, Mammals of the Yukon Terr., Nat. Mus. Can. Publ. Zool., 10: 115 (has not been karyotyped (RSH)). Range poorly known; diploid number is 30 for males and females and the 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; or groenlandicus; see Hall, 1981:836.