Order Rodentia - Family Muridae Author Guy G. Musser Author Michael D. Carleton text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 501 755 book chapter http://doi.org/10.5281/zenodo.7353098 1-56098-217-9 7353098 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 ).