Order Rodentia - Family Cricetidae Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 2 955 1189 book chapter 0-8018-8221-4 10.5281/zenodo.7316535 Microtus chrotorrhinus Miller 1894 Microtus chrotorrhinus Miller 1894 , Proc. Boston Soc. Nat. Hist., 26: 190 . Type Locality: USA , New Hampshire , Coos Co., Mt Washington , head of Tuckerman's Ravine, 5300 ft ( 1615 m ). Vernacular Names: Rock Vole . Synonyms: Microtus carolinensis Komarek 1932 ; Microtus ravus Bangs 1898 . Distribution: S Labrador south through S Quebec and Ontario , Canada , to NE Minnesota, N New York , and N New England states, USA ; isolated segments in the C (S New York , NE Pennsylvania ) and S Appalachian Mtns (W Maryland to E Tennessee and W North Carolina ). Conservation: IUCN – Data Deficient as M. c. ravus , Lower Risk (nt) as M. c. carolinensis , otherwise Lower Risk (lc). Discussion: Although conventionally viewed as closely related to ( Anderson, 1960 ), if not conspecific with ( Hall and Kelson, 1959 ), M. xanthognathus , morphological, chromosomal, and molecular information reveals their more distant kinship ( Bailey, 1900 ; Conroy and Cook, 2000 a ; Guilday, 1982 ; R . A. Martin, 1973 , 1979; Rausch and Rausch, 1974 ). The expanded definition of the subgenus Aulacomys (= M. chrotorrhinus , M. longicaudus , M. richardsoni , M. xanthognathus ) as conceived by Zagorodnyuk (1990) is decidedly polyphyletic on parsimony and likelihood trees generated from mitochondrial DNA sequences ( Conroy and Cook, 2000 a ). Genic variation evaluated by Kilpatrick and Crowell (1985) . See Kirkland and Jannett (1982 , Mammalian Species, 180).