Monomorium emarginatum DuBois, 1986: 101, figs. 111-118 (w.q.) U.S.A. (Virginia). Nearctic.

Primary type information: Type-material: holotype queen. Type-locality: U.S.A.: Virginia, Rappahannock County, Amissville 3.2 km. W, 21.vi.1957 (W.L. Brown & E.O. Wilson). Type-depository: MCZC. Secondary type information: Paratype-material: 7 paratype workers, 3 paratype queens. Paratype-locality: 3 paratype workers, 1 paratype queen Massachusetts, Barnstable County, Cape Cod, Brewster, 4.viii.1955 (W.L. Brown), 4 paratype workers, 2 paratype queens Massachusetts, Plymouth County, Woods Hole, 15.vii.1930 (A.H. Sturtevant). Paratype-depositories: MCZC, USNM.