Sciurus hudsonius Richardsoni True, Proc. U. S. Nat. Mus., 7:595, 1884.
Sciurus hudsonius Richardsoni [Allen], Bull. Amer. Mus. Nat. Hist., 10:265, July 22, 1898.
Sciurus hudsonicus richardsoni [Miller], U. S. Nat. Mus. Bull., 128:211, April 29, 1924.
Tamiasciurus hudsonicus richardsoni [Svihla] and [Svihla], Murrelet, 21:55, December 20, 1940.
Type.—Obtained at the head of Big Lost River, Custer County, Idaho.
Racial characters.—Color paler, especially on back.
Measurements.—Four males and 4 females average, respectively: total length 339, 339; length of tail 133, 131; hind foot 54, 51; ear 24, 24; weight 256, 266.
Distribution.—The Blue Mountains of southeastern Washington.