Dicrostonyx unalascensis Merriam, 1900. Proc. Washington Acad. Sci., 2:25.
TYPE LOCALITY: USA, Alaska, Umnak Island.
DISTRIBUTION: Umnak and Unalaska islands of Aleutian Archipelago, Alaska, USA.
SYNONYMS: stevensoni.
COMMENTS: Only species of Dicrostonyx to lack molt to white winter pelage and acquistion of snow claws (see Rausch and Rausch, 1972).