Reithrodontomys fulvescens J. A. Allen, 1894 . Bull. Am. Mus. Nat. Hist., 6:319.

TYPE LOCALITY: Mexico, Sonora, Oposura, 2000 ft .

DISTRIBUTION: SC Arizona to SW Missouri to WC Mississippi, USA, south through Mexico, to W Nicaragua; excluding Yucatan Peninsula and Caribbean coastal lowlands.

SYNONYMS: amoenus, aurantius, canus, chiapensis, chrysotis, difficilis, griseoflavus, helvolus, inexspectatus, infernatis, intermedius, laceyi, mustelinus, nelsoni, tenuis, toltecus, tropicalis .

COMMENTS: Subgenus Reithrodontomys, fulvescens species group. Chromosomal complement (2n=50) interpreted as primitive for the genus (Robbins and Baker, 1980). See Spencer and Cameron (1982, Mammalian Species, 174).