Bombus brachycephalus Handlirsch, 1888:244, ♂♀xw. 1 ♂, 2 ♀♀, 2 xww, Mexico (Cuernavacca, Orizaba) (leg. Bilimek); Franklin, 1913Franklin, H.J. 1913. The Bombidae of the New World. Part II - Species south of the United States. Transactions of the American Entomological Society 39 (2):73-200.:143, Typex 2 xqq, 2 xww, 1 ♂ (k. k. Hofmuseum at Vienna). Replacement name for Bombus diligens Smith, 1862 by Handlirsch, 1888Handlirsch, A. 1888. Die Hummelsammlung des k. k. naturhistorischen Hofmuseums. Annalen des Naturhistorischen Museums in Wien 3:209-250.:244. - 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); Franklin, 1913Franklin, H.J. 1913. The Bombidae of the New World. Transactions of the American Entomological Society 38 (3/4):177-486. (distribution); Franklin, 1913Franklin, H.J. 1913. The Bombidae of the New World. Part II - Species south of the United States. Transactions of the American Entomological Society 39 (2):73-200. (distribution); Meade-Waldo, 1916Meade-Waldo, G. 1916. Notes on the Apidae (Hymenoptera) in the collecition of the British Museum, with description of new species. The Annals and Magazine of Natural History ser. 8: v. 17:448-470.:470 ( listed as synonym of Bombus diligens Smith, 1862); Lutz & Cockerell, 1920Lutz, F.E. & T.D.A. Cockerell 1920. Notes on the distribution and bibliography of North American bees of the families, Apidae, Meliponidae, Bombidae, Euglossidae, and Anthophoridae. Bull. Amer. Mus. Nat. Hist 42 (15):491-641.:512 ( listed as synonym of Bombus diligens Smith, 1862); Abrahamovich & Díaz, 2002Abrahamovich, A.H. & N.B. Díaz 2002. Bumble bees of the Neotropical Region (Hymenoptera: Apidae). Biota Colombiana 3 (2):199-214. (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); Dardón et al., 2016Dardón, M.J., C.L. Yurrita & M. Vásquez 2016. Catalogue of the bees of the genus Bombus Latreille, 1802 (Hymenoptera: Apoidea: Apidae) in Guatemala. Revista Cientifica 26 (1):9-19. (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); Dardón et al., 2020Dardón, M.J., C.L. Yurrita, P. Landaverde-González P. & A.R. Vásquez M. 2020. Rediscovering the diversity of Guatemalan bumble bees (Hymenoptera: Apoidea: Bombus Latreille, 1802). International Journal of Scientific Research in Biological Sciences 7 (2):1-14. (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).
Bremus neotropicus Frison, 1928:151 - Dardón et al., 2016Dardón, M.J., C.L. Yurrita & M. Vásquez 2016. Catalogue of the bees of the genus Bombus Latreille, 1802 (Hymenoptera: Apoidea: Apidae) in Guatemala. Revista Cientifica 26 (1):9-19.:13 ( listed as synonym of Bombus brachycephalus Handlirsch, 1888). - As Bombus neotropicus: - 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).
Bombus krusemani Asperen de Boer, 1990:1 - Dardón et al., 2016Dardón, M.J., C.L. Yurrita & M. Vásquez 2016. Catalogue of the bees of the genus Bombus Latreille, 1802 (Hymenoptera: Apoidea: Apidae) in Guatemala. Revista Cientifica 26 (1):9-19.:13 ( listed as synonym of Bombus brachycephalus Handlirsch, 1888); Dardón et al., 2020Dardón, M.J., C.L. Yurrita, P. Landaverde-González P. & A.R. Vásquez M. 2020. Rediscovering the diversity of Guatemalan bumble bees (Hymenoptera: Apoidea: Bombus Latreille, 1802). International Journal of Scientific Research in Biological Sciences 7 (2):1-14.:4 ( listed as synonym of Bombus brachycephalus Handlirsch, 1888).