The ermines of the islands of southeastern Alaska, excepting possibly the incompletely known _seclusa_, have fewer characters of the Arctic races and more characters of the races of the adjoining mainland. Therefore, a possible inference is that the distinctive characters of ermines of the Alaskan islands developed with the aid of isolation from stocks which reached the islands after the glacial period. _M. e. haidarum_ may have found its way to the Queen Charlotte Islands in the glacial period.
_Specimens examined._--Total number, 17, as follows. Arranged by locality from north to south. Unless otherwise indicated, specimens are in the U. S. National Museum.
=British Columbia.= Queen Charlotte Islands. Masset, 7 (4[74], 1[2], 1[59]); Skidegate, 1; Graham Island, 5 (2[94], 1[77], 1[2]); Cumsheva Inlet, 3; no locality more definite than Queen Charlotte Islands, 1[2].
_Mustela cicognanii anguinae_ Hall, Univ. California Publ. Zoöl., 38:417, November 8, 1932.
_Putorius cicognanii_, Baird, Mamm. N. Amer., p. 161, 1858 (part).
_Putorius streatori_, Swarth, Univ. California Publ. Zoöl., 10:102, February 13, 1912.
_Mustela erminea anguinae_ Hall, Journ. Mamm., 26:79, February 27, 1945; Hall, Journ. Mamm., 26:181, July 19, 1945.
_Type._--Male, adult, complete skeleton (no skin); no. 12482, Mus. Vert. Zoöl., French Creek, Vancouver Island, British Columbia; found as a desiccated carcass on May 1, 1910; obtained by Harry S. Swarth.
_Range._--Vancouver Island, British Columbia. See figures 25, 27 pages 95, 149.
_Characters for ready recognition._--Differs from _M. e. haidarum_, in both sexes, in light-colored underparts less than half the width of dark-colored upper parts, proximal two-thirds of under surface of tail colored like upper parts instead of underparts, interorbital breadth less than distance between glenoid fossa and posterior margin of external auditory meatus; from _M. e. fallenda_, in both sexes, anterior margin of tympanic bullae flush with squamosal rather than projecting from floor of braincase, in males by sagittal crest absent, in females by total length more than 238 and tooth-rows about same length as, instead of longer than, tympanic bulla; from _M. e. streatori_, in male, by sagittal crest absent and hind foot ordinarily more than 33.5, in female by hind foot more than 27.5, basilar length more than 30.2; from _M. e. olympica_, in males, by greater average size, hind foot ordinarily more than 33.4 and interorbital breadth ordinarily more than 8.5, in females by larger size, total length more than 235, tail more than 65, hind foot more than 27.5, basilar length more than 30.2.