Aplodontia rufa grisea [Taylor], Univ. California Publ. Zoöl., 12:497, May 6, 1916 (type from Renton, King County, Washington).
Aplodontia rufa rufa [Taylor], Univ. California Publ. Zoöl., 12:497, May 6, 1916.
Type.—None. Based on a description by Lewis and Clark. [Taylor] (1918: 455) regarded as typical specimens collected at "Marmot, Clackamas County, Oregon (western slope of Mount Hood, not far from the Columbia River)."
Racial characters.—Size small; skull small.
Measurements.—Eight males and 7 females, from the area about Puget Sound, average, respectively: total length 343, 338; length of tail 37.5, 33.5; hind foot 57.8, 56; ear 25, 24.5; weight 1342, 1300 grams.
Distribution.—Western Washington, between Puget Sound and the Cascade Mountains and southward. Marginal localities are: Bellingham (U.S.N.M.), Sauk (U.S.N.M.), Forks of Skykomish River (W.W.D.), North Bend (U.S.N.M.), and mouth of Klama River (M.V.Z.).
Remarks.—Individual variation in mountain beavers is considerable. Two weakly defined races are recognized in Washington.
Aplodontia rufa rainieri [Merriam]
Aplodontia major rainieri [Merriam], Proc. Biol. Soc. Washington, 13:21, January 31, 1899.
[Haplodontia rufa] raineri [Elliot], Field Columb. Mus. Publ. 45, zoöl. ser., 2:112, 1901.