1944. =seclusa= (_Mustela erminea_) Hall, Proc. Biol. Soc. Washington, 57:39, June 28, 1944, applies to the ermine of Suemez Island, southeastern Alaska.
1945. =invicta= (_Mustela erminea_) Hall, Jour. Mamm., 26:75, February 27, 1945, applies to the ermine of the Rocky Mountains for several hundred miles both north and south of the United States-Canadian boundary.
1945. =fallenda= (_Mustela erminea_) Hall, Jour. Mamm., 26:79, February 27, 1945, applies to the ermine of the coastal mainland in southern British Columbia and northern Washington.
1945. =olympica= (_Mustela erminea_) Hall, Jour. Mamm., 26:81, February 27, 1945, applies to the diminutive ermine of the Olympic Peninsula, state of Washington.
1945. =gulosa= (_Mustela erminea_) Hall, Jour. Mamm., 26:84, February 27, 1945, applies to the diminutive ermine of the Cascades in Washington.
1945. =bangsi= (_Mustela erminea_) Hall, Jour. Mamm., 26:176, July 19, 1945, is the name applied today to the ermine of the western Great Lakes region.
In 1925 when this study was begun, the American weasels (subgenus _Mustela_ proper) were arranged as belonging to 47 kinds (including subspecies) of 29 full species. In the present account a total of 68 kinds, belonging to 4 full species are recognized in the subgenus _Mustela_. The increase in number of subspecies and the decrease in number of species are the nomenclatural results ordinarily obtained in this decade from a systematic study of a genus of American mammals.
CHECK-LIST OF AMERICAN SPECIES AND SUBSPECIES OF THE GENUS MUSTELA
PAGE _Mustela erminea_ 87 _Mustela erminea arctica_ (Merriam) 96 _Mustela erminea polaris_ (Barrett-Hamilton) 103 _Mustela erminea semplei_ Sutton and Hamilton 105 _Mustela erminea kadiacensis_ (Merriam) 108 _Mustela erminea richardsonii_ Bonaparte 110 _Mustela erminea cicognanii_ Bonaparte 118 _Mustela erminea bangsi_ Hall 124 _Mustela erminea invicta_ Hall 128 _Mustela erminea alascensis_ (Merriam) 131 _Mustela erminea salva_ Hall 135 _Mustela erminea initis_ Hall 136 _Mustela erminea celenda_ Hall 139 _Mustela erminea seclusa_ Hall 141 _Mustela erminea haidarum_ (Preble) 142 _Mustela erminea anguinae_ Hall 145 _Mustela erminea fallenda_ Hall 148 _Mustela erminea olympica_ Hall 153 _Mustela erminea streatori_ (Merriam) 155 _Mustela erminea gulosa_ Hall 159 _Mustela erminea muricus_ (Bangs) 161 _Mustela erminea angustidens_ (Brown) 165