Colletes intermixtus Swenk, 1905:302, ♀. Holotype ♀, Fedor, Lee County, Texas, April 22nd, 1904 (University of Nebraska, leg. G. Birkmann). - Timberlake, 1943Timberlake, P.H. 1943. Bees of the genus Colletes chiefly from Colorado. Bulletin of the American Museum of Natural History 81:385-410. (distribution); Stephen, 1954Stephen, W.P. 1954. A revision of the bee genus Colletes in America north of Mexico (Hymenoptera, Colletidae). University of Kansas Science Bulletin 36:149-527. (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).
Colletes lippiarum Cockerell, 1909:394 Synonymized with Colletes intermixtus Swenk, 1905 by Timberlake, 1943Timberlake, P.H. 1943. Bees of the genus Colletes chiefly from Colorado. Bulletin of the American Museum of Natural History 81:385-410.:399. - Stephen, 1954Stephen, W.P. 1954. A revision of the bee genus Colletes in America north of Mexico (Hymenoptera, Colletidae). University of Kansas Science Bulletin 36:149-527.:455 ( listed as synonym of Colletes intermixtus Swenk, 1905); 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.:1757 ( listed as synonym of Colletes intermixtus Swenk, 1905).