=Wisconsin.= _Douglas County_: T. 44N, R. 13W, 1; Gordon, 1. _Bayfield County_: Brinks Camp, Washburn, 1[2]; "near Cable," 1. _Ashland County_: Bear Lake, 2. _Iron County_: Fisher Lake, 4; Mercer, 5. _Vilas County_: Mamie Lake, 16[91]; Ox Bow Lake, 1[91]. _Oneida County_: Tomahawk Lake, 1[60]. _Langlade County_: T. 34N, R. 11E, 3. _Rush County_: Ladysmith, 1. _Dunn County_: Colfax, 2. _Door County_: Mink River, Ellison Bay, 1[76]. _Dodge County_: Fox Lake, 1[50]; Beaver Dam, 12[50]. =Mustela erminea invicta= Hall Ermine Plates 2, 3, 4, 9, 10, 11 and 41 _Mustela erminea invicta_ Hall, Journ. Mamm., 26:75, February 27, 1945; Hall, Journ. Mamm., 26:180, July 19, 1945. _Putorius cicognanii_, Preble, N. Amer. Fauna, 27:230, October 26, 1908. _Type._--Male, subadult, skull and skin; no. 101122, Mus. Vert. Zoöl.; Benewah, Benewah County, Idaho; October 24, 1926; obtained by William T. Shaw. The skull has a hole in the right squamosal bone on the floor of the braincase, and lacks the hamular process of the left pterygoid. The postmolar part of the right lower jaw is missing. The teeth all are present and entire. The skin is in white, winter pelage, well made, and in a good state of preservation. _Range._--Central Rocky Mountain region from Jasper Park south over Alberta, southeastern British Columbia, Washington east of the Cascades, and north and central Idaho and northwestern Montana. See figure 25 on page 95. _Characters for ready recognition._--Differs from _M. e. richardsonii_, in males, by skull lighter than 1.9 grams, mastoid breadth less than 19.9, depth of skull at anterior margin of basioccipital less than 12.4, in females by corresponding measurement of depth less than 10.1, and weight of skull less than one gram; from _M. e. fallenda_, in both sexes, by upper lips white (not brown), in males by skull averaging longer (37.0 versus 35.7), in females by breadth of rostrum less, instead of more, than 30 per cent of basilar length; from _M. e. streatori_, _gulosa_, and _muricus_ by hind foot more than 36 and basilar length more than 35 in males and by hind foot more than 29.5 and basilar length more than 30.5 in females; further distinguished from _streatori_ by white (not brown) upper lips and from _gulosa_ by black tip of tail more than half length of tail-vertebrae. _Description._--_Size._--Male: Ten adults and subadults from central Idaho County yield average and extreme measurements as follows: Total length, 291 (272-328); length of tail, 86 (75-100); length of hind foot, 39.9 (38-44). Female: Five adults and subadults from the same locality yield average and extreme measurements as follows: Total length, 255 (245-270); length of tail, 71 (68-76); length of hind foot, 32.3 (32-33).