1881. =jelskii= (_Mustela_) Taczanowski [= _Mustela frenata macrura_], Proc. Zoöl. Soc. London, for 1881, p. 647, May 17, 1881, was proposed for the female in the mistaken opinion that it was specifically distinct from the larger male which the same author previously had named _macrura_.
1891. =arizonensis= (_Putorius_) Mearns [= _Mustela frenata arizonensis_], Bull. Amer. Mus. Nat. Hist., 3:234, June 5, 1891, until 1936 was applied to long-tailed weasels of most of the western United States west of the Great Plains but by restriction since 1936 has been applied only to the animals in parts of Arizona and New Mexico.
1894. =peninsulae= (_Putorius_) Rhoads [= _Mustela frenata peninsulae_], Proc. Acad. Nat. Sci. Philadelphia, 1894:152, June 19, 1894, applies to the weasel of central and southern Florida.
1896. =alascensis= (_Putorius richardsonii_) Merriam [= _Mustela erminea alascensis_], N. Amer. Fauna, 11:12, June 30, 1896, with type locality at Juneau, Alaska, has been used for the ermine of southeastern Alaska ever since it was proposed. In 1944 separate subspecific rank was accorded ermines on several of the islands of southeastern Alaska which proportionately restricted the range assigned to _alascensis_.
1896. =streatori= (_Putorius_) Merriam [= _Mustela erminea streatori_], N. Amer. Fauna, 11:13, June 30, 1896, applies to the ermine of the Pacific Coast from Puget Sound, Washington, south nearly to the Golden Gate of California.
1896. =arcticus= (_Putorius_) Merriam [= _Mustela erminea arctica_], N. Amer. Fauna, 11:15, June 30, 1896. Ever since it was proposed, this name has been applied to the subspecies of ermine of Alaska and the northern parts of Canada.
1896. =kadiacensis= ([_Putorius arcticus_]) Merriam [= _Mustela erminea kadiacensis_], N. Amer. Fauna, 11:16, June 30, 1896, is a valid name applied to the ermine of Kodiak Island, Alaska.
1896. =washingtoni= (_Putorius_) Merriam [= _Mustela frenata washingtoni_], N. Amer. Fauna 11:18, June 30, 1896, applies to the long-tailed weasel of the southern Cascades of Washington and the northern Cascades of Oregon.
1896. =saturatus= (_Putorius_) Merriam [= _Mustela frenata saturata_], N. Amer. Fauna, 11:21, June 30, 1896, was little used until 1936 but applies to long-tailed weasel of limited region in northern California and southern Oregon.