Mesochorus americanus Cresson, 1872:23, ♀.Pennsylvania, Delaware, Illinois. - Cresson, 1872Cresson, E.T. 1872. Descriptions of North American Hymenoptera, No. 1. The Canadian Entomologist 4 (2):21-24. (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).
Mesochorus scitulus Cresson, 1872:24, ♂♀. 23 ♀♂, Pennsylvania. - 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); 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.:707 ( listed as synonym of Mesochorus americanus Cresson, 1872).
Mesochorus aprilinus Ashmead, 1896:195, ♀. 5 ♀♀, reared April 12 to 18, 1881; ♀♀, Washington, D. C.; N. J., N. Y., Mass., Conn. and Ill.. - Ashmead, 1896Ashmead, W.H. 1896. Descriptions of new parasitic Hymenoptera. Transactions of the American Entomological Society and Proceedings of the Entomological Section of the Academy of Natural Sciences 23:179-234. (distribution); 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); 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.:707 ( listed as synonym of Mesochorus americanus Cresson, 1872).
Mesochorus frontalis Ashmead, 1899:336 - 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.:707 ( listed as synonym of Mesochorus americanus Cresson, 1872).