At Elk River, Minnesota, B. Bailey (1929:156) found this species to be about half as abundant as _Mustela cicognanii_ and that it is "more often found in the open timber and about the dry ridges and fields." Of seventeen adult or subadult skulls of this race from Minnesota, ten have obvious marks of infestation of the frontal sinuses. In no skull, however, has the infestation resulted in so much malformation, as occurs in _noveboracensis_. _Specimens examined._--Total number, 76, arranged alphabetically by states and from north to south by counties in each state. =Iowa.= _Lyon County_: Granite, 1[65]. _Howard County_: Chester, 6[12]. _Winneshiek County_: Decorah, 1[12]; 8 mi. NE Ossian, 1[76]. _Allamakee County_: Lansing, 2[12]. _Clay County_: Island, 1[76]; Webb, 1[2]. _Palo Alto County_: Ruthven, 1[76]; no locality more definite than county, 1[76]. _Calhoun County_: Manson, 1[65]. _Webster County_: Barnum, 1[65]; Moorland, 1[65]; no locality more definite than county, 1[65]. _Boone County_: Pilot Mound, 3[12]; Amaqua Township, Sec. 19, 1[65]. _Story County_: Ames, 1[65]. =Minnesota.= _Kittson County_, 1[2]. _Roseau County_: 2-1/2 mi. SW Roseau, Jadis Township, 1[14]. _Itasca County_: T. 61N, R. 26W, 1[104]. _Clay County_: Moorhead, 2[9]. _Atkin County_: Atkin, 1[50]. _Otter Tail County_: Lake Lizzie, 1[9]; Parkers Prairie, 1[57]. _Grant County_: 3 mi. NW Barrett, 1[76]. _Benton_ (now Mille Lacs?) _County_: Princeton, 1[91]. _Sherburne County_: Elk River, 14 (6[59], 4[14], 3[91], 1[74]). _Hennepin County_: Fort Snelling, 6 (5[2], 1[91]). _Carver? County_: Chaska, 1[60]. _Lac qui Parle County_: Madison, 5 (3[91], 2[1]); no locality more definite than county, 2 (1[68], 1[75]). _Yellow Medicine County_: Wood Lake, 1[2]. _Blue Earth County_: Rapidan, 1[64]. _County_ in question: Moore Lake, 1[91]. =Nebraska.= _Cuming County_: Beemer, 5[91]. =North Dakota.= _Cass County_: Fargo, 1[91]; Casselton, 1[91]. _Dickey County_: Oakes, 1[91]. =South Dakota.= _Roberts County_, 1[102]. _Marshall County_: Fort Sisseton, 1[91]. _Douglas County_: Armour, 1[14]. _Clay County_, 1[102]. =Mustela frenata longicauda= Bonaparte Long-tailed Weasel Plates 16, 17, 18, 31, 32 and 33 _Mustela longicauda_ Bonaparte, Charlesworth's Mag. Nat. Hist., 2:38, 1838. _Putorius longicauda_, Baird, Mamm. N. Amer., p. 169, 1858; Coues, Fur-bearing animals, p. 136, 1877; Bangs, Proc. Biol. Soc. Washington, 10:7, figs. 1, 1a of pls. 1, 2 and 3, February 25, 1896; Merriam, N. Amer. Fauna, 11:19, pl. 3, figs. 3, 3a, 4, 4a, pl. 5, figs. 1, 1a, text figs. 7-9, June 30, 1896. _Mustela longicauda longicauda_, Bailey, N. Amer. Fauna, 49:166, January 8, 1927.