Oryzomys delticola Thomas, 1917 . Ann. Mag. Nat. Hist., ser. 8, 20:96.

TYPE LOCALITY: Argentina, Buenos Aires Prov., Ella Isl .

DISTRIBUTION: Uruguay and N.E. Argentina.

COMMENT: Subgenus Oligoryzomys; see Langguth, 1963, Communic. Zool. Mus. Hist. Nat. Montevideo, 7(99):1 — 19, Massoia, 1973, Rev. Invest. Agro. INTA, ser. 1, 10(l): 21 —37, and Gardner and Patton, 1976, Occas. Pap. Mus. Zool. La. St. Univ., 49:19. Possibly conspecific with longicaudatus; see Cabrera, 1961:389, who placed this species in subgenus Oryzomys .

ISIS NUMBER: 5301410008035023001.