Megachile abacula Cresson, 1878:130, ♂♀. 12 ♂♀, Mexico (leg. Sumichrast); Raw, 2004Raw, A. 2004. Leafcutter and Mason Bees: a biological catalogue of the genus Megachile of the Neotropics. :1-97.:27, Type ♀ (ANSP, 2437); Raw, 2007Raw, A. 2007. An annotated catalogue of the leafcutter and mason bees (genus Megachile) of the Neotropics. Zootaxa 1601:1-127.:27, Type ♀, examined (ANSP, 2437). - 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); Cockerell, 1899Cockerell, T.D.A. 1899. Catálogo de las Abejas de Mexico. Biblioteca Agricola de las Secretaria de Fomento, Mexico, 1-20. (distribution); Mitchell, 1930Mitchell, T.B. 1930. A contribution to the knowledge of Neotropical Megachile with descriptions of new species (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 56 (3):155-305. (distribution); Raw, 2004Raw, A. 2004. Leafcutter and Mason Bees: a biological catalogue of the genus Megachile of the Neotropics. :1-97. (distribution); Raw, 2007Raw, A. 2007. An annotated catalogue of the leafcutter and mason bees (genus Megachile) of the Neotropics. Zootaxa 1601:1-127. (distribution); Sagot et al., 2018Sagot, P, J. Mérida, R. Ayala & R. Vandame 2018. Situación actual del conocimiento de la fauna de abejas (Apoidea: Anthophila) del estado de Chiapas, México. In: (Ed.). Memorias X Congreso Mesoamericano sobre Abejas Nativas. 191-2011. (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 Chalicodoma abacula: - Snelling, 1990Snelling, R.R. 1990. A review of the native North American bees of the genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Natural History Museum Los Angeles County 421:1-39. (distribution).
Megachile gualanensis Cockerell, 1912:27, ♂♀. 8 ♂♂, 4 ♀♀, Gualan, Guatemala (leg. W.P. Cockerell); Holotype ♀, Gualan, Guatemala (leg. W.P. Cockerell); Raw, 2004Raw, A. 2004. Leafcutter and Mason Bees: a biological catalogue of the genus Megachile of the Neotropics. :1-97.:27, Type ♀ (USNM, 54861); Raw, 2007Raw, A. 2007. An annotated catalogue of the leafcutter and mason bees (genus Megachile) of the Neotropics. Zootaxa 1601:1-127.:27, Type ♀, examined (USNM, 54861). Synonymized with Chalicodoma abacula (Cresson, 1878) by Snelling, 1990Snelling, R.R. 1990. A review of the native North American bees of the genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Natural History Museum Los Angeles County 421:1-39.:25. - Mitchell, 1930Mitchell, T.B. 1930. A contribution to the knowledge of Neotropical Megachile with descriptions of new species (Hymenoptera: Megachilidae). Transactions of the American Entomological Society 56 (3):155-305. (distribution); Cockerell, 1946Cockerell, T.D.A. 1946. New species and subspecies collected in a month in Guatemala. Journal of the New York Entomological Society 54 (3):203-206. (distribution); Raw, 2004Raw, A. 2004. Leafcutter and Mason Bees: a biological catalogue of the genus Megachile of the Neotropics. :1-97.:27 ( listed as synonym of Megachile abacula Cresson, 1878); Raw, 2007Raw, A. 2007. An annotated catalogue of the leafcutter and mason bees (genus Megachile) of the Neotropics. Zootaxa 1601:1-127.:27 ( listed as synonym of Megachile abacula Cresson, 1878).