Megachile mellitarsis Cresson, 1878:121, 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.:196, Type ♂ (A.N.S.P., no. 2462). - 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); 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).
Megachile terrestris Cockerell, 1908:260, ♀. Holotype ♀, Florissant, Colorado, 8000 feet, June 14, 1907 (leg. S.A. Rohwer). - 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.:194 ( listed as synonym of Megachile mellitarsis Cresson, 1878); Oliveira Lima & Silvestre, 2017Oliveira Lima, F.V. de & R. Silvestre 2017. Abelhas (Hymenoptera, Apidae sensu lato) do Estado de Mato Grosso do Sul, Brasil. Iheringia Série Zoologia 107 (supl.):1-14. (distribution).
Megachile geophila Cockerell, 1908:460, no description Replacement name for Megachile terrestris Cockerell, 1908 by Cockerell, 1908Cockerell, T.D.A. 1908. A new name in Megachile. The Canadian Entomologist 40 (12):460.:460 (not of Schrottky, 1903). - Cockerell, 1908Cockerell, T.D.A. 1908. A new name in Megachile. The Canadian Entomologist 40 (12):460. (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.:194 ( listed as synonym of Megachile mellitarsis Cresson, 1878).