Prosacantha annulicornis Ashmead, 1893:186 (key), 188, ♀. Types ♀♀, Washington, D. C. (National Museum, American Entomological Society, and Coll. Ashmead); Fouts, 1948Fouts, R.M. 1948. Parasitic wasps of the genus Trimorus in North America. Proceedings of the United States National Museum 98 (No. 3225):91-148.:129, Type ♀ (U.S.N.M., No. 2240); Masner & Muesebeck, 1968Masner, L. & C.F.W. Muesebeck 1968. The Types of Proctotrupoidea (Hymenoptera) in the United States National Museum. 270:1-143.:47, Lectotype ♀ (USNM, no. 2240). - As Trimorus annulicornis: - 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); Talamas et al., 2017Talamas, E.J., J. Thompson, A. Cutler, S. Fitzsimmons Schoenberger, A. Cuminale, T. Jung, N.F. Johnson, A.A. Valerio, A.B. Smith, V. Haltermann, E. Alvarez, C. Schwantes, C. Blewer, C. Bodenreider, A. Salzberg, P. Luo, D. Meislin & M.L. Buffington 2017. An online photographic catalog of primary types of Platygastroidea (Hymenoptera) in the National Museum of Natural History, Smithsonian Institution. Journal of Hymenoptera Research 56:187-224. (distribution).
Trimorus pulchricornis Fouts, 1948:104, ♀. Holotype ♀, Glen Echo, Md. (U.S.N.M., No. 57775, leg. Fouts). Synonymized with Trimorus annulicornis (Ashmead, 1893) by Talamas et al., 2017Talamas, E.J., J. Thompson, A. Cutler, S. Fitzsimmons Schoenberger, A. Cuminale, T. Jung, N.F. Johnson, A.A. Valerio, A.B. Smith, V. Haltermann, E. Alvarez, C. Schwantes, C. Blewer, C. Bodenreider, A. Salzberg, P. Luo, D. Meislin & M.L. Buffington 2017. An online photographic catalog of primary types of Platygastroidea (Hymenoptera) in the National Museum of Natural History, Smithsonian Institution. Journal of Hymenoptera Research 56:187-224.:211.