Reithrodontomys brevirostris Goodwin, 1943 . Am. Mus. Novit., 1231:1.

TYPE LOCALITY: Costa Rica, Alajuela Prov., canyons above Villa Quesada, 5000 ft .

DISTRIBUTION: Allopatric populations in highlands of NC Nicaragua (see Jones and Genoways, 1970) and C Costa Rica.

SYNONYMS: nicaraguae .

COMMENTS: Subgenus Aporodon, mexicanus species group. See Jones and Baldassarre (1982, Mammalian Species, 192).