_Remarks._--The smaller size, especially of females, is the principal feature distinguishing this race from _streatori_. On the basis of available data the female of _olympica_ is smaller than that of any other race and hence is the smallest adult weasel of the species _erminea_, in either the Old World or in America. Intergradation with _streatori_ is indicated by specimens from the southern end of Puget Sound. These specimens are intermediate in size between typical examples of the two races concerned. The color of the upper parts is uniform and the color pattern varies less than in geographically adjoining races. The white color of the underparts is restricted to a thin line on the abdominal region, but widens out posteriorly in the inguinal region and anteriorly over the pectoral region, throat, chin and lower lips. The upper lips are brown. The brown of the upper parts extends around in front of each foreleg, the two brown areas not quite meeting on the lower throat. The above description applies to each of the 19 specimens examined with regard to these details. Every specimen seen in the winter coat was brown, not white. _Specimens examined._--Total number, 20, arranged by counties from north to south. Unless otherwise indicated, specimens are in the U. S. National Museum. =Washington.= _Clallam County_: Clallam Bay, 2 (1[74], 1[94]); Elwha, 2[10]; Johnsons Ranch, 1[60]; Happy Lake, 1[60]; Boulder Lake, 2[60]; near head of Soleduc River, 4500 ft., 1; 12 mi. S Port Angeles, 1[10]. _Jefferson County_: Hayes Cr., 2000 ft., Elwha River, 2; head N Fork Quinault River, 4000 ft., 1; Duckabush, 3; N Fork Skokomish River, 1. _Mason County_: Lake Cushman, 2[76]; 4 mi. S Olympia, 1. =Mustela erminea streatori= (Merriam) Ermine Plates 5, 6, 7, 12, 13 and 14 _Putorius streatori Merriam_, N. Amer. Fauna, 11:13, pl. 2, figs. 5, 5a, 6, 6a, June 30, 1896. _Putorius cicognanii_, Baird, Mamm. N. Amer., p. 161, 1858 (part unless no. 2395 was a female of _M. frenata_). _Putorius pusillus_, Baird, Mamm. N. Amer., p. 159, 1858 (part). _Putorius (Gale) vulgaris_, Coues, Fur-bearing animals, p. 102, 1877 (part). _Mustela streatori streatori_, Miller, U. S. Nat. Mus. Bull., 79:96, December 31, 1912; Grinnell, Univ. California Publ. Zoöl., 40:101, September 26, 1933. _Mustela cicognanii streatori_, Hall, Murrelet, 12:22, January, 1931; Hall, Univ. California Publ. Zoöl., 38:417, November 8, 1932. _Mustela erminea streatori_, Hall, Journ. Mamm., 26:77, February 27, 1945; Hall, Journ. Mamm., 26:181, July 19, 1945. _Mustela rixosa_, Beer, Journ. Mamm., 29:296, August 31, 1948. _Type._--Male, adult, skull and skin; no. 76646, U. S. Nat. Mus., Biol. Surv. Coll.; Mount Vernon, Skagit Valley, Skagit County, Washington; February 29, 1896; obtained by D. R. Luckey, original no. 3.