1932. =anguinae= (_Mustela cicognanii_) Hall [= _Mustela erminea anguinae_], Univ. California Publ. Zoöl., 38:417, November 8, 1932, applies to the ermine of Vancouver Island, British Columbia. 1935. =labiata= (_Mustela arctica_) Degerbøl [= _Mustela erminea semplei_], Rept. 5th Thule Exped., 1921-1924, vol. 2, no. 4, p. 25, 1935. When Degerbøl wrote his description and proposed this name he was unaware that Sutton and Hamilton had three years before based a new name on weasels from Southampton Island. Because the two names apply to the same subspecies, Degerbøl's name, _labiata_, must fall as a synonym of _semplei_ which has priority. 1935. =helleri= (_Mustela frenata_) Hall, Proc. Biol. Soc. Washington, 48:143, August 22, 1935, applies to the long-tailed weasel of eastern Perú. 1936. =nevadensis= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 91, November 20, 1945, applies to the long-tailed weasel of the western United States. For many years, animals of this subspecies were referred to _longicauda_ and from 1891 until 1936 to _arizonensis_. 1936. =effera= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 93, November 20, 1945, applies to the long-tailed weasel of the Blue Mountains region. From 1891 until 1936 this animal was referred to under the name _arizonensis_. 1936. =altifrontalis= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 94, November 20, 1936, applies to the long-tailed weasel of the humid coastal district from Puget Sound southward into Oregon. 1936. =nigriauris= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 95, November 20, 1936, applies to the long-tailed weasel of the coastal district of California from San Francisco Bay southward to Point Concepcion. Previous to 1936, _xanthogenys_ was the name applied to this race of weasel. 1936. =latirostra= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 96, November 20, 1936, applies to the long-tailed weasel of southern California which previously had borne the name _xanthogenys_. 1936. =pulchra= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 98, November 20, 1936, is applied to the long-tailed weasel of the southern end of the San Joaquin Valley of California. 1936. =inyoensis= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 99, November 20, 1936, is applied to the long-tailed weasel of Owens Valley, California. 1936. =texensis= (_Mustela frenata_) Hall, Carnegie Inst. Washington, publ. no. 473, p. 99, November 20, 1936, applies to the long-tailed weasel of central Texas which previously had been assigned to the subspecies _frenata_.