Psen Kohlii Fox, 1898:9, ♂♀. 4 ♂♀, Philadelphia, Pa.; Virginia. - Fox, 1898Fox, W.J. 1898. The species of Psen inhabiting America north of Mexico. Transactions of the American Entomological Society 25:1-18. (distribution); Malloch, 1933Malloch, J.R. 1933. Review of the wasps of the subfamily Pseninae of North America (Hymenoptera: Aculeata). Proceedings of the United States National Museum 82:1-60. (distribution). - As Psen kohlii kohlii: - Krombein, 1963Krombein, K.V. 1963. Natural history of Plummers Island, Maryland. XVII. Annotated list of the wasps (Hymenoptera: Bethyloidea, Scolioidea, Vespoidea, Pompiloidea, Sphecoidea). Proceedings of the Biological Society of Washington 76:255-280. (distribution). - As Pseneo longiventris kohlii: - Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (distribution).
Psen fulvipes Malloch, 1933:11, ♀. Holotype ♀, Coleta, Ala. (U.S.N.M., No. 44206, leg. H. H. Smith). - Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1598 ( listed as synonym of Pseneo longiventris kohlii (Fox, 1898)).
Psen angulatus Malloch, 1933:12, ♂. Holotype ♂, Nelson County, Va., August 10, 1924 (U.S.N.M., No. 44208, leg. W. Robinson). - Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1598 ( listed as synonym of Pseneo longiventris kohlii (Fox, 1898)).