Stephanus bicolor Westwood, 1841:538, Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370.:367, Type ♀ (Linnaean So., London). - Dalla Torre, 1901-1902Dalla Torre, C.G. 1901-1902. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. — Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. Pars II. Breitkopf & Härtel, Leipzig. VIII + 1141. (distribution). - As Megischus bicolor: - Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370.:366 (comb. nov.); 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198. (distribution); Aguiar & Johnson, 2003Aguiar, A.P. & N.F. Johnson 2003. Stephanidae (Hymenoptera) of America North of Mexico. Proceedings of the Entomological Society of Washington 105 (2):467-783. (distribution); Ramos & Arias, 2018Ramos, Y.J.A. & D.Q. Arias 2018. Aulacidae, Gasteruptiidae y Stephanidae (Insecta, Hymenoptera) de Panamá. Tecnociencia 20 (1):27-34. (distribution); Añino & Quintero, 2018Añino Ramos, Y.J. & D. Quintero Arias 2018. Aulacidae, Gasteruptiidae y Stephanidae (Insecta: Hymenoptera) de Panamá. Tecnociencia 20 (1):27-34. (distribution); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48. (distribution). - As Megischus bicolor bicolor: - Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370. (distribution).
Stephanus Sickmanni Schletterer, 1889:152, Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370.:367, Type ♀ (Berlin). Synonymized with Megischus bicolor (Westwood, 1841) by 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198.:741. - Aguiar & Johnson, 2003Aguiar, A.P. & N.F. Johnson 2003. Stephanidae (Hymenoptera) of America North of Mexico. Proceedings of the Entomological Society of Washington 105 (2):467-783.:475 ( listed as synonym of Megischus bicolor (Westwood, 1841)); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48.:34 ( listed as synonym of Megischus bicolor (Westwood, 1841)). - As Megischus bicolor sickmanni: - Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370. (distribution), 367 (comb. nov.). - As Stephanus sickmannii: - Dalla Torre, 1901-1902Dalla Torre, C.G. 1901-1902. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. — Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. Pars II. Breitkopf & Härtel, Leipzig. VIII + 1141. (distribution).
Megischus floridanus Davis, 1897:349, ♂♀. 1 ♀, 1 ♂, Florida, June 15th (leg. T.C. Priddey); Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370.:367, Type ♀ (Philadelphia). - 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198.:741 ( listed as synonym of Megischus bicolor (Westwood, 1841)); Aguiar & Johnson, 2003Aguiar, A.P. & N.F. Johnson 2003. Stephanidae (Hymenoptera) of America North of Mexico. Proceedings of the Entomological Society of Washington 105 (2):467-783.:476 ( listed as synonym of Megischus bicolor (Westwood, 1841)); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48.:34 ( listed as synonym of Megischus bicolor (Westwood, 1841)). - As Stephanus floridanus: - Dalla Torre, 1901-1902Dalla Torre, C.G. 1901-1902. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. — Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. Pars II. Breitkopf & Härtel, Leipzig. VIII + 1141. (distribution).
Megischus canadensis Davis, 1897:349, ♀. Holotype ♀, Toronto, Canada, July 15th (leg. T.C. Priddey); Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370.:367, Type ♀ (Philadelphia). Synonymized with Megischus bicolor sickmanni Schletterer, 1889 by Townes, 1949Townes, H.K. 1949. The Nearctic species of Stephanidae. Proceedings of the United States National Museum 99 (No. 3243):361-370.:367. Synonymized with Megischus bicolor (Westwood, 1841) by 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198.:741. - Aguiar & Johnson, 2003Aguiar, A.P. & N.F. Johnson 2003. Stephanidae (Hymenoptera) of America North of Mexico. Proceedings of the Entomological Society of Washington 105 (2):467-783.:476 ( listed as synonym of Megischus bicolor (Westwood, 1841)); Añino Ramos, 2018Añino Ramos, Y.J. 2018. . Dissertation , , 1-48.:34 ( listed as synonym of Megischus bicolor (Westwood, 1841)). - As Stephanus canadensis: - Dalla Torre, 1901-1902Dalla Torre, C.G. 1901-1902. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus. — Volumen III: Trigonalidae, Megalyridae, Stephanidae, Ichneumonidae, Agriotypidae, Evaniidae, Pelecinidae. Pars II. Breitkopf & Härtel, Leipzig. VIII + 1141. (distribution).