Peromyscus stirtoni Dickey, 1928 . Proc. Biol. Soc. Washington, 41:5.

TYPE LOCALITY: El Salvador, La Union, Rio Goascoran, 13 deg. 30' N, 100 ft .

DISTRIBUTION: Intermittently found in dry to semiarid lowlands from SE Guatemala, through El Salvador and Honduras, to NC Nicaragua.

COMMENTS: Although Hooper (19686) questioned the specific recognition of P. stirtoni, others have substantiated its distinctive morphology and habitat (Huckaby, 1980; Jones and Yates, 1983). Late Holocene remains from Guanacaste Prov., Costa Rica, suggest a recent range contraction of this species (see Woodman, 1988). See Jones (1990, Mammalian Species, 361). Tentatively retained in the mexicanus species group (Carleton, 1989).