Peltastes pollinctòrius Say, 1836:245, ♂♀. ♂, ♀, Pennsylvania and Indiana; Townes & Townes, 1959Townes, H.K. & M. Townes 1959. Ichneumon-flies of America north of Mexico: 1. Subfamily Metopiinae. Bulletin of the United States National Museum 216 (1):1-318.:98, Types destroyed. - Say, 1836Say, T. 1836. Descriptions of new North American Hymenoptera, and observations on some already described. Boston Journal of Natural History 1 (3):209-305. (distribution). - As Metopius pollinctorius pollinctorius: - Townes & Townes, 1959Townes, H.K. & M. Townes 1959. Ichneumon-flies of America north of Mexico: 1. Subfamily Metopiinae. Bulletin of the United States National Museum 216 (1):1-318. (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).
Metopius cordiger Brullé, 1846:120, ♂. Holotype ♂, Caroline (leg. Bosc); Townes & Townes, 1959Townes, H.K. & M. Townes 1959. Ichneumon-flies of America north of Mexico: 1. Subfamily Metopiinae. Bulletin of the United States National Museum 216 (1):1-318.:98, Type ♂ (Paris). Synonymized with Metopius pollinctorius (Say, 1836) by Walsh, 1873Walsh, B.D. 1873. Descriptions of North American Hymenoptera (with notes by E. T. Cresson). Trans. St. Louis Acad. Sci. 3:65-166.:91. - Townes & Townes, 1959Townes, H.K. & M. Townes 1959. Ichneumon-flies of America north of Mexico: 1. Subfamily Metopiinae. Bulletin of the United States National Museum 216 (1):1-318.:98 ( listed as synonym of Metopius pollinctorius pollinctorius (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.:553 ( listed as synonym of Metopius pollinctorius pollinctorius (Say, 1836)).
Metopius pinatorius Brullé, 1846:120, ♂. Holotype ♂, Caroline (ancienne collection de Bosc). Synonymized with Metopius pollinctorius (Say, 1836) by Walsh, 1873Walsh, B.D. 1873. Descriptions of North American Hymenoptera (with notes by E. T. Cresson). Trans. St. Louis Acad. Sci. 3:65-166.:91.