Reithrodontomys burti Benson, 1939 . Proc. Biol. Soc. Washington, 52:147.

TYPE LOCALITY: Mexico, Sonora, Rio Sonora, Rancho de Costa Rica .

DISTRIBUTION: WC Sonora to C Sinaloa, Mexico.

COMMENTS: Subgenus Reithrodontomys, megalotis species group. A relict species having close affinity to R. montanus (Hooper, 1952) .