Osmia conjuncta Cresson, 1864:31, ♀. Holotype ♀, Connecticut (Coll. E. Norton). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Robertson, 1897Robertson, C. 1897. North American bees - Descriptions and synonyms. Transactions of the Academy of Science of St. Louis 7 (14):315-356. (distribution); Cockerell, 1912Cockerell, T.D.A. 1912. Names applied to bees of the genus Osmia, found in North America. Proceedings of the United States National Museum 42:215-225. (distribution); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (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).
Osmia 4-dentata Cresson, 1878:107, ♂.New York (leg. Comstock). - Robertson, 1897Robertson, C. 1897. North American bees - Descriptions and synonyms. Transactions of the Academy of Science of St. Louis 7 (14):315-356.:347 ( listed as synonym of Osmia conjuncta Cresson, 1864); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:81 ( listed as synonym of Osmia conjuncta Cresson, 1864); 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.:2049 ( listed as synonym of Osmia conjuncta Cresson, 1864). - As Osmia quadridentata: - Cockerell, 1912Cockerell, T.D.A. 1912. Names applied to bees of the genus Osmia, found in North America. Proceedings of the United States National Museum 42:215-225. (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.:2049 (emendation). - As Osmia quadridentata: - Cockerell, 1912Cockerell, T.D.A. 1912. Names applied to bees of the genus Osmia, found in North America. Proceedings of the United States National Museum 42:215-225. (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.:2049 (emendation).
Osmia cressonii Dalla Torre, 1896:392, no descr. Replacement name for Osmia quadridentata Cresson, 1878 by Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643.:392 (nec Fonscolombe). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Robertson, 1897Robertson, C. 1897. North American bees - Descriptions and synonyms. Transactions of the Academy of Science of St. Louis 7 (14):315-356.:347 ( listed as synonym of Osmia conjuncta Cresson, 1864). - As Osmia cressoni: - 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.:2049 ( listed as synonym of Osmia conjuncta Cresson, 1864).