Cryptus orbus Say, 1836:231, sex not indicated.Indiana; Cushman, 1929Cushman, R.A. 1929. A revision of the North American Ichneumon-flies of the genus Mesostenus and related genera. Proceedings of the United States National Museum 74 (art. 16):1-58.:30, Neotype (U.S.N.M.); Cushman, 1929Cushman, R.A. 1929. A revision of the North American Ichneumon-flies of the genus Mesostenus and related genera. Proceedings of the United States National Museum 74 (art. 16):1-58.:30, Type, lost; Townes & Townes, 1962Townes, H.K. & M. Townes 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. Bulletin of the United States National Museum 216 (3):1-602.:395, Type ♀, destroyed; Kasparyan & Ruíz-Cancino, 2004Kasparyan, D.R. & E. Ruíz Cancino 2004. Review of North American species of the genus Lymeon Foerster, 1869 (Hymenoptera: Ichneumonidae: Cryptini). Zoosystematica Rossica 13 (1):53-79.:69, Type ♀ (destroyed). - 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 Diapetimorpha orba: - Cushman, 1929Cushman, R.A. 1929. A revision of the North American Ichneumon-flies of the genus Mesostenus and related genera. Proceedings of the United States National Museum 74 (art. 16):1-58. (distribution). - As Lymeon orbum: - Townes & Townes, 1962Townes, H.K. & M. Townes 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. Bulletin of the United States National Museum 216 (3):1-602. (distribution); Porter, 1975Porter, C.C. 1975. A new floridian Polycyrtidea with comments on Zoogeography of Florida Mesostenini (Hymenoptera: Ichneumonidae). The Florida Entomologist 58 (4):247-255. (distribution). - As Lymeon orbus: - 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); Ruíz-Cancino & Coronado-Blanco, 2002Ruíz-Cancino, E. & J.M. Coronado-Blanco 2002. Artrópodos terrestres de los estados de Tamaulipas y Nuevo León, México. Serie Publicaciones Cientificas No. 4:1-376. (distribution); Kasparyan & Ruíz-Cancino, 2004Kasparyan, D.R. & E. Ruíz Cancino 2004. Review of North American species of the genus Lymeon Foerster, 1869 (Hymenoptera: Ichneumonidae: Cryptini). Zoosystematica Rossica 13 (1):53-79. (distribution); González-Moreno & Bordera, 2012González-Moreno, A. & S. Bordera 2012. The Ichneumonidae (Hymenoptera: Ichneumonoidea) of Ría Lagartos Biosphere Reserve, Yucatán, Mexico. Zootaxa 3230:1-51. (distribution).
Mesostenus diligens Cresson, 1878:207, ♀.Illinois (leg. Lewis); Cushman, 1929Cushman, R.A. 1929. A revision of the North American Ichneumon-flies of the genus Mesostenus and related genera. Proceedings of the United States National Museum 74 (art. 16):1-58.:30, Type (Acad. Nat. Sci. Phila., No. 1175); Townes & Townes, 1962Townes, H.K. & M. Townes 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. Bulletin of the United States National Museum 216 (3):1-602.:395, Type ♀ (Philadelphia); Kasparyan & Ruíz-Cancino, 2004Kasparyan, D.R. & E. Ruíz Cancino 2004. Review of North American species of the genus Lymeon Foerster, 1869 (Hymenoptera: Ichneumonidae: Cryptini). Zoosystematica Rossica 13 (1):53-79.:69, Type ♀ (ANSP); Kasparyan & Ruíz-Cancino, 2008Kasparyan, D.R. & E. Ruíz Cancino 2008. Cryptini de México (Hymenoptera: Ichneumonidae: Cryptinae) Parte II. Victoría, México. 1-373.:109, Type ♀ (Mus. Filadelfia). - 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); Cushman, 1929Cushman, R.A. 1929. A revision of the North American Ichneumon-flies of the genus Mesostenus and related genera. Proceedings of the United States National Museum 74 (art. 16):1-58.:30 ( listed as synonym of Diapetimorpha orba (Say, 1836)); Townes & Townes, 1962Townes, H.K. & M. Townes 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. Bulletin of the United States National Museum 216 (3):1-602.:395 ( listed as synonym of Lymeon orbum (Say, 1836)); 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.:475 ( listed as synonym of Lymeon orbus (Say, 1836)); Kasparyan & Ruíz-Cancino, 2004Kasparyan, D.R. & E. Ruíz Cancino 2004. Review of North American species of the genus Lymeon Foerster, 1869 (Hymenoptera: Ichneumonidae: Cryptini). Zoosystematica Rossica 13 (1):53-79.:69 ( listed as synonym of Lymeon orbus (Say, 1836)); Kasparyan & Ruíz-Cancino, 2008Kasparyan, D.R. & E. Ruíz Cancino 2008. Cryptini de México (Hymenoptera: Ichneumonidae: Cryptinae) Parte II. Victoría, México. 1-373.:109 ( listed as synonym of Lymeon orbus (Say, 1836)).
Lymeon annulicornis Ashmead, 1894:243, ♀. Holotype ♀, Utica, Miss.; Townes & Townes, 1962Townes, H.K. & M. Townes 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. Bulletin of the United States National Museum 216 (3):1-602.:395, Type ♀ (Washington). - Cushman, 1929Cushman, R.A. 1929. A revision of the North American Ichneumon-flies of the genus Mesostenus and related genera. Proceedings of the United States National Museum 74 (art. 16):1-58.:30 ( listed as synonym of Diapetimorpha orba (Say, 1836)); Townes & Townes, 1962Townes, H.K. & M. Townes 1962. Ichneumon-flies of America north of Mexico: 3. Subfamily Gelinae, tribe Mesostenini. Bulletin of the United States National Museum 216 (3):1-602.:395 ( listed as synonym of Lymeon orbum (Say, 1836)); 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.:475 ( listed as synonym of Lymeon orbus (Say, 1836)); Kasparyan & Ruíz-Cancino, 2004Kasparyan, D.R. & E. Ruíz Cancino 2004. Review of North American species of the genus Lymeon Foerster, 1869 (Hymenoptera: Ichneumonidae: Cryptini). Zoosystematica Rossica 13 (1):53-79.:69 ( listed as synonym of Lymeon orbus (Say, 1836)); Kasparyan & Ruíz-Cancino, 2008Kasparyan, D.R. & E. Ruíz Cancino 2008. Cryptini de México (Hymenoptera: Ichneumonidae: Cryptinae) Parte II. Victoría, México. 1-373.:109 ( listed as synonym of Lymeon orbus (Say, 1836)); Kasparyan, 2017Kasparyan, D.R. 2017. Two new species of the genus Lymeon (Hymenoptera: Ichneumonidae: Cryptinae: Cryptini) from Mexico. Zoosystematica Rossica 26 (2):276-281.:277 ( listed as synonym of Lymeon orbus (Say, 1836)).