Microtus oaxacensis Goodwin, 1966 . Am. Mus. Novit., 2243:1 -4.

TYPE LOCALITY: Mexico, Oaxaca, Ixtlan Dist., near Vista Hermosa, Tarabundi Ranch, 5000 ft .

DISTRIBUTION: Sierra de Juarez, NC Oaxaca, Mexico.

COMMENTS: Relationships obscure: differentially diagnosed with respect to M. mexicanus and M. umbrosus by Goodwin (1966); description amplified and resemblance to M. guatemalensis noted by Jones and Genoways (1967); grouped with other relictual "pitymyine" species found at southern edge of Nearctic-Microtus distribution by Hoffmann and Koeppl (1985).