Mustela frenata nevadensis [Hall], Carnegie Inst. Washington, Publ. 473:91, November 20, 1936.
Type.—Obtained 3 miles east of Baker, White Pine County, Nevada, by E. R. [Hall] and W. C. [Russell] on May 30, 1929; type in Museum of Vertebrate Zoölogy.
Racial characters.—Size medium; colors pale; back near Brussels Brown in summer, chin white and underparts yellow, rarely orange; color in winter white with black tip on tail.
Measurements.—A male from Neppel, Grant County, measures: total length 412; length of tail 151; hind foot 43; ear 19. Two males from Yakima, Yakima County, average: 379; 135; 42.5; 21; weight 176.5. A female from Ellensburg and one from 4 miles east of Ellensburg, Kittitas County, average: 284; 98; 33; 17.
Distribution.—From the high Cascades eastward, save for the Blue Mountains area. Marginal occurrences are Barron ([Hall], 1936: 93) and Easton (W. W. D.).
Remarks.—Specimens from the northern Cascades are intergrades between nevadensis and the form to the west, altifrontalis. Specimens from extreme northeastern Washington might be referred to oribasa Bangs as readily as to nevadensis.
Mustela frenata effera [Hall]-
Mustela frenata effera [Hall], Carnegie Inst. Washington, Publ. 473:93, November 20, 1936.
Type.—Obtained at Ironside, Malheur County, Oregon, by H. E. Anthony on September 8, 1912; type in American Museum of Natural History.