Andronicus cylindricus Cresson, 1864:384, ♂. Holotype ♂, Connecticut (E. Norton). - Dalla Torre, 1896Dalla Torre, C.G. 1896. Catalogus Hymenopterorum hucusque descriptorum systematicus et synonymicus, X. Apidae (Anthophila). Sumptibus Guilelmi Engelmann, 1-643. (distribution); Robertson, 1897Robertson, C. 1897. North American bees - Descriptions and synonyms. Transactions of the Academy of Science of St. Louis 7 (14):315-356. (distribution); Cockerell, 1916Cockerell, T.D.A. 1916. Bees from the northern peninsula of Michigan. Occ. Papers Mus. Zool. Univ. of Michigan 23:1-10. (distribution); Cockerell, 1919Cockerell, T.D.A. 1919. Descriptions and records of bees. - LXXXVI. The Annals and Magazine of Natural History ser. 9: v. 4 (20):98-104. (distribution); Cockerell, 1926Cockerell, T.D.A. 1926. Descriptions and records of bees. - CXI. The Annals and Magazine of Natural History ser. 9: v. 17 (102):657-665. (distribution). - As Hoplitis cylindrica: - Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318. (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).
Hoplitis monardæ Cockerell, 1914:363, ♀. ♀, Kerrville, Texas, May 31, 1906 (U.S. National Museum, leg. F.C. Pratt). - Cockerell, 1924Cockerell, T.D.A. 1924. Descriptions and records of bees. - CI. The Annals and Magazine of Natural History ser. 9: v. 14 (79):179-185. (distribution); Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318.:314 ( listed as synonym of Hoplitis cylindrica (Cresson, 1864)); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:59 ( listed as synonym of Hoplitis cylindrica (Cresson, 1864)); 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.:2014 ( listed as synonym of Hoplitis cylindrica (Cresson, 1864)).
Hoplitis hicksi Cockerell, 1932:203 - Michener, 1947Michener, C.D. 1947. A revision of the american species of Hoplitis (Hymenoptera, Megachilidae). Bulletin of the American Museum of Natural History 89:257-318.:314 ( listed as synonym of Hoplitis cylindrica (Cresson, 1864)); Mitchell, 1962Mitchell, T.B. 1962. Bees of the Eastern United States. Volume II. Technical bulletin (North Carolina Agricultural Experiment Station) 152:1-557.:59 ( listed as synonym of Hoplitis cylindrica (Cresson, 1864)); 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.:2014 ( listed as synonym of Hoplitis cylindrica (Cresson, 1864)).