Platygaster Canadensis Provancher, 1887:181, Fouts, 1924Fouts, R.M. 1924. Revision of the North American wasps of the subfamily Platygasterinae. Proceedings of the United States National Museum 63 (art. 15):1-145.:12, Paratype ♂ (National Museum, No. 25427). - Ashmead, 1887Ashmead, W.H. 1887. Studies of the North American Proctotrupidae, with descriptions of new species from Florida (Paper no. 2). The Canadian Entomologist 19:125-132. (distribution). - As Isocybus canadensis: - Dalla Torre, 1898Dalla Torre, C.G. 1898. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, V. Chalcididae et Proctotrupidae. Sumptibus Guilelmi Engelmann, VII + 598. (distribution); Fouts, 1924Fouts, R.M. 1924. Revision of the North American wasps of the subfamily Platygasterinae. Proceedings of the United States National Museum 63 (art. 15):1-145. (distribution); 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).
Isocybus nigriclavus Ashmead, 1893:327 (key), 328, ♀. Types, Greeley, Colo. (Coll. Ashmead); Fouts, 1924Fouts, R.M. 1924. Revision of the North American wasps of the subfamily Platygasterinae. Proceedings of the United States National Museum 63 (art. 15):1-145.:12, Types (National Museum, No. 2306); Masner & Muesebeck, 1968Masner, L. & C.F.W. Muesebeck 1968. The Types of Proctotrupoidea (Hymenoptera) in the United States National Museum. 270:1-143.:81, Lectotype ♀ (USNM, no. 2306). - Dalla Torre, 1898Dalla Torre, C.G. 1898. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, V. Chalcididae et Proctotrupidae. Sumptibus Guilelmi Engelmann, VII + 598. (distribution); Fouts, 1924Fouts, R.M. 1924. Revision of the North American wasps of the subfamily Platygasterinae. Proceedings of the United States National Museum 63 (art. 15):1-145.:11 ( listed as synonym of Isocybus canadensis (Provancher, 1887)); 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.:1176 ( listed as synonym of Isocybus canadensis (Provancher, 1887)).