Microtus chrotorrhinus (Miller, 1894) . Proc. Boston Soc. Nat. Hist., 26:190.

TYPE LOCALITY: USA, New Hampshire, Coos Co., Mount Washington, head of Tuckerman's Ravine, 5300 ft .

DISTRIBUTION: S Labrador southwest through S Quebec and Ontario, Canada, to NE Minnesota, USA; south in Appalachian Mtns to E Tennessee and W North Carolina, USA.

SYNONYMS: carolinensis, ravus .

COMMENTS: Subgenus Aulacomys, sole member of chrotorrhinus species group sensu Zagorodnyuk (1990) . Although conventionally viewed as closely related to (Anderson, 1960), if not conspecific with (Hall and Kelson, 1959) M. xanthognathus, morphological and chromosomal traits reveal their more distant kinship (Bailey, 1900; Guilday, 1982; R. L. Martin, 1973, 1979; Rausch and Rausch, 1974). Genic variation evaluated by Kilpatrick and Crowell (1985). See Kirkland and Jannett (1982, Mammalian Species, 180).