Megachile Sayi Cresson, 1878:119, ♂♀ ?. 8 ♂♀, Del., N.C., Ga., Kans., Tex.. - Cresson, 1878Cresson, E.T. 1878. Descriptions of new North American Hymenoptera in the collection of the American Entomological Society. Transactions of the American Entomological Society 7:61-136. (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.:350 ( listed as synonym of Megachile inimica Cresson, 1872); Cockerell, 1904Cockerell, T.D.A. 1904. Some bees from San Miguel County, New Mexico. The Entomologist 37 (488):5-9. (distribution); Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution). - As Megachile inimica sayi: - Cockerell, 1899Cockerell, T.D.A. 1899. Catálogo de las Abejas de Mexico. Biblioteca Agricola de las Secretaria de Fomento, Mexico, 1-20. (distribution); Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VII. Taxonomy of the subgenus Sayapis (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (2):175-206. (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); Pascarella et al., 1999Pascarella, J.B., Waddington, K.D. & Neal, P.R. 1999. The Bee Fauna (Hymenoptera: Apoidea) of Everglades National Park, Florida and adjacent areas: Distribution, Phenology, and Biogeography. Journal of the Kansas Entomological Society 72 (1):32-45. (distribution); Vergara & Ayala, 2002Vergara, C.H. & R. Ayala 2002. Diversity, Phenology and Biogeography of the bees (Hymenoptera: Apoidea) of Zapotitlán de las Salinas, Puebla, Mexico. Journal of the Kansas Entomological Society 75 (1):16-30. (distribution); Yáñez-Ordóñez & Hinojosa-Díaz, 2004Yáñez-Ordóñez, O. & I. Hinojosa-Díaz 2004. La colección himenopterológica (Insecta) del Museo de Zoología Alfonso L. Herrera de la Facultad de Ciencias, UNAM, México. Acta Zoológica Mexicana (nueva serie) 20 (1):167-197. (distribution); Pascarella, 2006Pascarella, J.B. 2006. The bees of Florida. . (distribution); Owens et al., 2018Owens, B.E., L. Allain, E.C. van Gorder, J.L. Bossart & C.E. Carlton 2018. The bees (Hymenoptera: Apoidea) of Louisiana: An updated, annotated checklist. Proceedings of the Entomological Society of Washington 120 (2):272-307. (distribution). - As Megachile inmica sayi: - Estrada de Léon & Ayala Barajas, 1995Estrada de Léon, M. & R. Ayala Barajas 1995. Abejas silvestres (Hymenoptera: Apoidea) de la Sierra del Tigre, Jalisco. Apicultura Moderna 7:12-24. (distribution). - As Megachile inmica sayi: - Estrada de Léon & Ayala Barajas, 1995Estrada de Léon, M. & R. Ayala Barajas 1995. Abejas silvestres (Hymenoptera: Apoidea) de la Sierra del Tigre, Jalisco. Apicultura Moderna 7:12-24. (distribution).
Megachile heterodonta Cockerell, 1900:18, ♀. ♀, Las Vegas, Aug. 1 (leg. Porter & Cockerell); ♀, Fillmore Cañon, Organ Mts., about 5700 feet, Sept. 1 (leg. C.H.T. Townsend). - Cockerell, 1906Cockerell, T.D.A. 1906. The bees of New Mexico. Transactions of the American Entomological Society 32:289-314. (distribution); Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VII. Taxonomy of the subgenus Sayapis (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (2):175-206.:192 ( listed as synonym of Megachile inimica sayi Cresson, 1878); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:176 ( listed as synonym of Megachile inimica sayi Cresson, 1878); 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.:2071 ( listed as synonym of Megachile inimica sayi Cresson, 1878).
Megachile sayi paludicola Cockerell, 1911:254, ♀. Holotype ♀, Kerrville, Texas, April 10 to 12, 1907 (U.S.N.M., No. 13539, leg. F.C. Pratt). - Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:176 ( listed as synonym of Megachile inimica sayi Cresson, 1878); 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.:2071 ( listed as synonym of Megachile inimica sayi Cresson, 1878). - As Megachile inimica paludicola: - Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VII. Taxonomy of the subgenus Sayapis (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (2):175-206. (distribution).
Megachile sayi sancta Cockerell, 1912:487, ♂. Cockerell, 1912Cockerell, T.D.A. 1912. Descriptions and records of bees. - XLVII. The Annals and Magazine of Natural History ser. 8: v. 10 (59):484-494.:487, ♂, Santa Fé, New Mexico, August 3, 1912 (leg. Cockerell). - Mitchell, 1937Mitchell, T.B. 1937. A revision of the genus Megachile in the Nearctic Region. Part VII. Taxonomy of the subgenus Sayapis (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 63 (2):175-206.:192 ( listed as synonym of Megachile inimica sayi Cresson, 1878); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:176 ( listed as synonym of Megachile inimica sayi Cresson, 1878); 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.:2071 ( listed as synonym of Megachile inimica sayi Cresson, 1878).