Oryzomys nigripes (Olfers, 1818) . In Eschwege, Neue Bibl. Reisenb., 15:209.

TYPE LOCALITY: Paraguay, Paraguari Dept., Ybycui Nat. Park, 85 km S.S.E. Atyra .

DISTRIBUTION: Paraguay; E. Brazil; Argentina.

COMMENT: Includes eliurus; see Cabrera, 1961:394, Massoia and Fornes, 1967, Acta Zool. Lilloana, 23:407-430, and Myers and Carleton, 1981, Misc. Publ. Mus. Zool. Univ. Mich., 161:35; but see Massoia, 1973, Rev. Invest. Agro. INTA, ser. 1, 10(l):21—37. O. eliurus may be a distinct species, based on karyotypic differences (OAR). Subgenus Oligoryzomys; see Hershkovitz, 1966, Z. Saugetierk., 31: 137, who included flavescens, fulvescens, and longicaudatus in this species, but Gardner and Patton, 1976, Occas. Pap. Mus. Zool. La. St. Univ., 49:20, 24, considered them distinct species and indicated that the relationship between nigripes and longicaudatus requires elucidation. Myers and Carleton, 1981, Misc. Publ. Mus. Zool. Univ. Mich., 161:1 -41, considered longicaudatus and flavescens distinct species, and also considered tarso nigro Fischer, 1814, invalid (see comments under Reithrodon physodes); AL employs the name tarsonigro for this species. Cabrera, 1961:380, placed Oligoryzomys in subgenus Oryzomys as a synonym.

ISIS NUMBER: 5301410008035048001.