Oryzomys rostratus Merriam, 1901 . Proc. Washington Acad. Sci., 3:293.

TYPE LOCALITY: Mexico, Puebla, Metlaltoyuca .

DISTRIBUTION: Deciduous and evergreen tropical forests from central Tamaulipas to Oaxaca and Yucatan Peninsula, Mexico, through Guatemala, El Salvador, and Honduras, to S Nicaragua.

SYNONYMS: carrorum, megadon, salvadorensis, yucatanensis .

COMMENTS: Considered a subspecies of O. melanotis (Hall, 1981; Hooper, 1953). Engstrom (1984) effectively argued the specific distinctiveness of O. rostratus (also see account of O. melanotis). Distributional records in Nicaragua reviewed, as O. melanotis megadon, by Jones and Engstrom (1986). Homogeneity of populations assigned to O. rostratus warrants additional study.