Bombus perplexus Cresson, 1863:91, ♂. Holotype ♂, Connecticut (Coll. E. Norton); Franklin, 1913Franklin, H.J. 1913. The Bombidae of the New World. Transactions of the American Entomological Society 38 (3/4):177-486.:344, I have been unable to locate the male [type] and it is possibly lost. - Franklin, 1913Franklin, H.J. 1913. The Bombidae of the New World. Transactions of the American Entomological Society 38 (3/4):177-486. (distribution); Bequaert, 1920Bequaert, J.C. 1920. Hymenoptera collected near Boston, Mass., with description of a variety of Bombus affinis. Psyche 27 (1):6-12. (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).
Bombus Hudsonicus Cresson, 1863:92, ♂. 2 ♂♂, Hudson's Bay Territory (Coll. E. Norton). - Franklin, 1913Franklin, H.J. 1913. The Bombidae of the New World. Transactions of the American Entomological Society 38 (3/4):177-486.:344 ( listed as synonym of Bombus perplexus Cresson, 1863); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:533 ( listed as synonym of Bombus perplexus Cresson, 1863); 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.:2200 ( listed as synonym of Bombus perplexus Cresson, 1863).
Bombus dorsalis Provancher, 1888:343 Synonymized with Bombus perplexus Cresson, 1863 by Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:533. - 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.:2200 ( listed as synonym of Bombus perplexus Cresson, 1863).