Microtus longicaudus (Merriam, 1888) . Am. Nat., 22:934.

REVIEWED BY: R. E. Barry, Jr. (REB).

TYPE LOCALITY: U.S.A., South Dakota, Custer Co., Custer (Black Hills), 5500 ft. (1676 m) .

DISTRIBUTION: Rocky Mtns., from N. Yukon and E. Alaska south to S. New Mexico and Arizona, and adjacent foothills and plains; east to W. South Dakota; west to N.W. Pacific Coast (U.S.A.).

COMMENT: Subgenus Chionomys, as in Anderson, 1960; or Microtus (— Arvalomys), as in Chaline, 1974, and Gromov and Polyakov, 1977:317. This widespread species is in need of taxonomic revision (SRL). Revised in part by Long, 1965, Univ. Kans. Publ. Mus. Nat. Hist., 14:493-758. Probably includes coronarius, an insular derivative (RSH, SRL).

ISIS NUMBER: 5301410008080021001.