1896. =leucoparia= (_Putorius frenatus_) Merriam [= _Mustela frenata leucoparia_], N. Amer. Fauna, 11:29, June 30, 1896, applies to the long-tailed weasel of Michoacán and Nayarit. 1896. =tropicalis= (_Putorius_) Merriam [= _Mustela frenata tropicalis_], N. Amer. Fauna, 11:30, June 30, 1896, applies to the long-tailed weasel of the Tropical Life-zone of Veracruz. 1896. =spadix= (_Putorius longicaudus_) Bangs [= _Mustela frenata spadix_], Proc. Biol. Soc. Washington, 10:8, February 25, 1896, applies to the long-tailed weasel of Minnesota and adjoining areas. 1896. =rixosus= (_Putorius_) Bangs [= _Mustela rixosa rixosa_], Proc. Biol. Soc. Washington, 10:21, February 25, 1896, applies to the least weasel of Saskatchewan and adjoining areas and as the first available name for the species has been used as the specific name for the species in America since 1896. 1897. =paraensis= (_Putorius (Mustela) braziliensis_) Goeldi [= _Mustela africana africana_], Zool. Jahrb., abt. f. systematik, geogr. u. biol., 10:560, pl. 21, September 15, 1897, a synonym for the weasel of the lower Amazon area. 1898. =neomexicanus= (_Putorius frenatus_) Barber and Cockerell [= _Mustela frenata neomexicana_], Proc. Acad. Nat. Sci. Philadelphia, p. 188, May 3, 1898, applies to the long-tailed weasel of New Mexico, Arizona, Durango and adjoining areas. 1898. =haidarum= (_Putorius_) Preble [= _Mustela erminea haidarum_], Proc. Biol. Soc. Washington, 12:169, August 10, 1898, applies to the ermine of the Queen Charlotte Islands, British Columbia. 1899. =notius= (_Putorius noveboracensis_) Bangs [= _Mustela frenata noveboracensis_], Proc. New England Zoöl. Club, 1:53, June 9, 1899, was applied to the long-tailed weasel of the Carolinas until 1936 since which time it has been regarded as a synonym of _noveboracensis_. 1899. =occisor= (_Putorius_) Bangs [= _Mustela frenata occisor_], Proc. New England Zoöl. Club, 1:54, June 9, 1899, applies to the long-tailed weasel of central and northern Maine. Until 1936, occisor was ordinarily used as the name of a full species but since then has been arranged as a subspecific name under _Mustela frenata_. 1899. =mundus= (_Putorius xanthogenys_) Bangs [= _Mustela frenata munda_], Proc. New England Zoöl. Club, 1:56, June 9, 1899, is now applied, and generally has been since 1899, to the long-tailed weasel of the coastal district of California north of San Francisco Bay. 1899. =muricus= (_Putorius (Arctogale)_) Bangs [= _Mustela erminea muricus_], Proc. New England Zoöl. Club, 1:71, July 31, 1899, applies to the diminutive ermine, often erroneously designated least weasel, of the western United States.