Coelioxys dubitata Smith, 1854:272, Cockerell, 1905Cockerell, T.D.A. 1905. Notes on some bees in the British Museum. Transactions of the American Entomological Society 31:309-364.:336, Type ♀ (British Museum); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680, Type ♀ (British Museum). Synonymized with Coelioxys rufitarsis rufitarsis Smith, 1854 by Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:220. - Smith, 1854Smith, F. 1854. Catalogue of Hymenopterous Insects in the Collection of the British Museum. Part II. Apidae. London. 465 pp, 8 pl. (distribution); Cresson, 1879Cresson, E.T. 1879. Catalogue of North American Apidae. Transactions of the American Entomological Society and Proceedings of the Entomological Section of the Academy of Natural Sciences 7:215-232. (distribution); 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.:345 ( listed as synonym of Coelioxys rufitarsis Smith, 1854); Lovell & Cockerell, 1907Lovell, J.H. & Cockerell, T.D.A. 1907. The Megachilidae of southern Maine. Psyche 14 (1):15-21.:20 ( listed as synonym of Coelioxys rufitarsis Smith, 1854); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680 ( listed as synonym of Coelioxys rufitarsis Smith, 1854); 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.:2078 ( listed as synonym of Coelioxys rufitarsis Smith, 1854).
Coelioxys rufitarsus Smith, 1854:271, ♂. ♂, United States (B.M.); Cockerell, 1905Cockerell, T.D.A. 1905. Notes on some bees in the British Museum. Transactions of the American Entomological Society 31:309-364.:336, Type ♂ (British Museum); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680, Type ♂ (British Museum). - Cresson, 1879Cresson, E.T. 1879. Catalogue of North American Apidae. Transactions of the American Entomological Society and Proceedings of the Entomological Section of the Academy of Natural Sciences 7:215-232. (distribution). - As Coelioxys rufitarsis: - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Cockerell, 1900Cockerell, T.D.A. 1900. The New Mexico bees of the genus Coelioxys. The Canadian Entomologist 32:297-301. (distribution); Cockerell, 1901Cockerell, T.D.A. 1901. Flower and insect records from New Mexico. Entomological News 12 (2):38-43. (distribution); Brues, 1903Brues, C.T. 1903. Studies of Texan bees. Part 1. Entomological News 14:79-85. (distribution); Lovell & Cockerell, 1907Lovell, J.H. & Cockerell, T.D.A. 1907. The Megachilidae of southern Maine. Psyche 14 (1):15-21. (distribution); Cockerell, 1912Cockerell, T.D.A. 1912. Some parasitic bees (Coelioxys). The Canadian Entomologist 44 (6):165-170. (distribution); Cockerell, 1921Cockerell, T.D.A. 1921. Some parasitic Megachilid bees of the Western United States. American Museum Novitates 21:1-11. (distribution); Cockerell, 1925Cockerell, T.D.A. 1925. Bees of the genus Coelioxys in the collection of the California Academy of Sciences. The Pan-Pacific Entomologist 1 (4):145-151. (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); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730. (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); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution); Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution). - As Coelioxys rufitarsis: - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Cockerell, 1900Cockerell, T.D.A. 1900. The New Mexico bees of the genus Coelioxys. The Canadian Entomologist 32:297-301. (distribution); Cockerell, 1901Cockerell, T.D.A. 1901. Flower and insect records from New Mexico. Entomological News 12 (2):38-43. (distribution); Brues, 1903Brues, C.T. 1903. Studies of Texan bees. Part 1. Entomological News 14:79-85. (distribution); Lovell & Cockerell, 1907Lovell, J.H. & Cockerell, T.D.A. 1907. The Megachilidae of southern Maine. Psyche 14 (1):15-21. (distribution); Cockerell, 1912Cockerell, T.D.A. 1912. Some parasitic bees (Coelioxys). The Canadian Entomologist 44 (6):165-170. (distribution); Cockerell, 1921Cockerell, T.D.A. 1921. Some parasitic Megachilid bees of the Western United States. American Museum Novitates 21:1-11. (distribution); Cockerell, 1925Cockerell, T.D.A. 1925. Bees of the genus Coelioxys in the collection of the California Academy of Sciences. The Pan-Pacific Entomologist 1 (4):145-151. (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); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730. (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); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution); Esperanza de Pedro, 2021Esperanza de Pedro, D. 2021. . :. (distribution); Nava-Bolaños & Osorio-Olvera, 2022Nava-Bolaños, A. & L. Osorio-Olvera 2022. Estado del arte del conocimiento de biodiversidad de los polinizadores de México. Revista Mexicana de Biodiversidad 93:1-77. (distribution). - As Coelioxys rufitarsis rufitarsis: - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (distribution). - As Coelioxys rufitarsis rufitarsis: - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557. (distribution).
Coelioxys Comstockii Cresson, 1878:96, ♀. Holotype ♀, New York (leg. Prof. J.H. Comstock); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680, Type ♀ (Academy of Natural Sciences of Philadelphia, #2497). Synonymized with Coelioxys rufitarsis Smith, 1854 by Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680. - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (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.:2078 ( listed as synonym of Coelioxys rufitarsis Smith, 1854).
Coelioxys coloradensis Cresson, 1878:98, ♂. Holotype ♂, Colorado (leg. Morrison); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680, Type ♂ (Academy of Natural Sciences of Philadelphia, #2500). Synonymized with Coelioxys rufitarsis Smith, 1854 by Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680. - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (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.:2078 ( listed as synonym of Coelioxys rufitarsis Smith, 1854).
Coelioxys rufitarsis rhois Cockerell, 1903:452, ♀. ♀, Rio Ruidoso, White Mts., N. M., about 6500 feet, July 22 (leg. C.H.T. Townsend); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680, Type ♀ (American Museum of Natural History). - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Cockerell, 1912Cockerell, T.D.A. 1912. Some parasitic bees (Coelioxys). The Canadian Entomologist 44 (6):165-170. (distribution); Cockerell, 1925Cockerell, T.D.A. 1925. Bees of the genus Coelioxys in the collection of the California Academy of Sciences. The Pan-Pacific Entomologist 1 (4):145-151. (distribution); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680 ( listed as synonym of Coelioxys rufitarsis Smith, 1854); 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.:2078 ( listed as synonym of Coelioxys rufitarsis Smith, 1854).
Coelioxys dubitata melanopoda Viereck, 1917:747 - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:220 ( listed as synonym of Coelioxys rufitarsis rufitarsis Smith, 1854).
Coelioxys rufitarsis claripes Cockerell, 1925:146, ♂. Holotype ♂, Keen Camp, Riverside County, California, June 6-12, 1917 (Mus. Calif. Acad. Sci., No. 1633, leg. E.P. Van Duzee); Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680, Type ♂ (California Academy of Sciences, #1633). - Baker, 1975Baker, J.R. 1975. Taxonomy of five nearctic subgenera of Coelioxys (Hymenoptera: Megachilidae). The University of Kansas Science Bulletin 50 (12):649-730.:680 ( listed as synonym of Coelioxys rufitarsis Smith, 1854); 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.:2078 ( listed as synonym of Coelioxys rufitarsis Smith, 1854).