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Ormocerus dirigoius Morin & Gates, n. sp. is described and compared to the North American O. americanus Dzhanokmen and Grissell and European species O. latus Walker and O. vernalis Walker. A range expansion into the Nearctic is reported for O. latus, previously only known from the Palearctic. Specimens were collected in Harpswell, Maine during a study of the parasitic Hymenoptera community associated with Operophtera brumata Linnaeus (Lepidoptera: Geometridae), an invasive species. The species are keyed and illustrated using macrophotography and scanning electron microphotography. [ABSTRACT FROM AUTHOR]