Mesitius californicus Ashmead, 1893:63 (key), 65, ♀. Types ♀♀, California (Coll. Ashmead and National Museum); Evans, 1969Evans, H.E. 1969. A revision of the genus Epyris in the Americas (Hymenoptera: Bethylidae). Transactions of the American Entomological Society 95 (2):181-352.:261, Plesiallotype ♂ (CDAS); Evans, 1969Evans, H.E. 1969. A revision of the genus Epyris in the Americas (Hymenoptera: Bethylidae). Transactions of the American Entomological Society 95 (2):181-352.:260, Type ♀ (USNM, No. 2189). - 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 Epyris californicus: - Evans, 1969Evans, H.E. 1969. A revision of the genus Epyris in the Americas (Hymenoptera: Bethylidae). Transactions of the American Entomological Society 95 (2):181-352. (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).
Mesitius minutus Ashmead, 1893:63 (key), 65, ♂. Holotype ♂, Arlington, Va. (Coll. Ashmead); Evans, 1969Evans, H.E. 1969. A revision of the genus Epyris in the Americas (Hymenoptera: Bethylidae). Transactions of the American Entomological Society 95 (2):181-352.:260, Type ♂ (USNM, No. 14071). Synonymized with Epyris californicus (Ashmead, 1893) by Evans, 1969Evans, H.E. 1969. A revision of the genus Epyris in the Americas (Hymenoptera: Bethylidae). Transactions of the American Entomological Society 95 (2):181-352.:260. - 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 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.:1209 ( listed as synonym of Epyris californicus (Ashmead, 1893)).