Bethylus centràtus Say, 1836:281,Indiana. - Cresson, 1862Cresson, E.T. 1862. Catalogue of the described species of North American Hymenoptera (Continued from page 211.). Proceedings of the Entomological Society of Philadelphia 1 (8):227-238. (distribution); Ashmead, 1887Ashmead, W.H. 1887. Studies on the North American Proctotrupidae, with descriptions of new species from Florida. (Part I.). Entomologica Americana 3:73-76, 97-100, 117-119. (distribution); Ashmead, 1893Ashmead, W.H. 1893. A monograph of the North American Proctotrypidae. Bulletin of the United States National Museum 45:1-472. (distribution); Dalla Torre, 1898Dalla Torre, C.G. 1898. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, V. Chalcididae et Proctotrupidae. Sumptibus Guilelmi Engelmann, VII + 598. (distribution). - As Laelius centratus: - Evans, 1964Evans, H.E. 1964. A synopsis of the american Bethylidae (Hymenoptera, Aculeata). Bulletin of the Museum of Comparative Zoology 132 (1):1-222. (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 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (distribution); Lanes et al., 2004Lanes, G.O., F.T. Gobbi & C.O. Azevedo 2004. Report on a collection of Bethylidae (Hymenoptera) from central Florida, USA, with description of a new species of LepidosternopsisA Ogloblin. Journal of Hymenoptera Research 13 (1):57-63. (distribution); Barbosa & Azevedo, 2011Barbosa, D.N. & C.O. Azevedo 2011. Phylogeny and reclassifi cation of Laelius (Hymenoptera: Bethylidae) and description of four new species. Insect Syst. Evol. 42:237-275. (distribution); Barbosa & Azevedo, 2014Barbosa, D.N. & C.O. Azevedo 2014. Revision of the Neotropical Laelius (Hymenoptera: Bethylidae) with notes on some Nearctic species. Zoologia 31 (3):285-311. (distribution).
Laelius trogodermatis Ashmead, 1893:50 (key), 51, ♀. Types 1 ♂, 1 ♀, District of Colombia (?) (National Museum), Lectotype ♀, examined (USNM, #2187), designated by Barbosa & Azevedo, 2014Barbosa, D.N. & C.O. Azevedo 2014. Revision of the Neotropical Laelius (Hymenoptera: Bethylidae) with notes on some Nearctic species. Zoologia 31 (3):285-311.:306. - Dalla Torre, 1898Dalla Torre, C.G. 1898. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, V. Chalcididae et Proctotrupidae. Sumptibus Guilelmi Engelmann, VII + 598. (distribution); Krombein, 1963Krombein, K.V. 1963. Natural history of Plummers Island, Maryland. XVII. Annotated list of the wasps (Hymenoptera: Bethyloidea, Scolioidea, Vespoidea, Pompiloidea, Sphecoidea). Proceedings of the Biological Society of Washington 76:255-280. (distribution); Evans, 1964Evans, H.E. 1964. A synopsis of the american Bethylidae (Hymenoptera, Aculeata). Bulletin of the Museum of Comparative Zoology 132 (1):1-222. (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 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (distribution); Barbosa & Azevedo, 2014Barbosa, D.N. & C.O. Azevedo 2014. Revision of the Neotropical Laelius (Hymenoptera: Bethylidae) with notes on some Nearctic species. Zoologia 31 (3):285-311.:306 ( listed as synonym of Laelius centratus (Say, 1836)).
Laelius occidentalis Whittaker, 1929:387, Barbosa & Azevedo, 2014Barbosa, D.N. & C.O. Azevedo 2014. Revision of the Neotropical Laelius (Hymenoptera: Bethylidae) with notes on some Nearctic species. Zoologia 31 (3):285-311.:306, Holotype, examined (BMNH, B.M. 1947-212). - Barbosa & Azevedo, 2014Barbosa, D.N. & C.O. Azevedo 2014. Revision of the Neotropical Laelius (Hymenoptera: Bethylidae) with notes on some Nearctic species. Zoologia 31 (3):285-311.:306 ( listed as synonym of Laelius centratus (Say, 1836)).