• Lectotype designation: Francoeur, 1973: 254.
• [Formica rufibarbis var. occidua Wheeler, 1912c: 90. Nomen nudum.]
• Subspecies of Formica rufibarbis: Wheeler, 1917a: 550; Emery, 1925d: 250; Essig, 1926: 867; Creighton, 1950a: 539; Smith, 1951c: 871; Smith, 1958c: 159.
• Status as species: Francoeur, 1973: 254 (redescription); Francoeur, 1975: 263; Hunt & Snelling, 1975: 23; Wheeler & Wheeler, 1977b: 16 (in key); Francoeur & Snelling, 1979: 6.
• Junior synonym of Formica moki: Francoeur, 1973: 254; Smith, 1979: 1453; Bolton, 1995b: 200.
• [Note: Francoeur gives Formica occidua as senior synonym, but Formica moki has priority (Smith, 1979: 1453).]

Obsolete combinations

• Formica rufibarbis occidua

Citations

• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Creighton, W. S. 1950a. The ants of North America. Bulletin of the Museum of Comparative Zoology 104:1-585. PDF
• Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183:1-302. PDF
• Essig, E. O. 1926. Insects of western North America. New York: Macmillan, xi + 1035 pp. PDF
• Francoeur, A. 1973. Révision taxonomique des espèces néarctiques du groupe fusca, genre Formica (Formicidae, Hymenoptera). Mémoires de la Société Entomologique du Québec 3:1-316. PDF
• Francoeur, A. 1975 ("1974"). Notes for a revision of the ant genus Formica. 1. New identifications and synonymies for some nearctic specimens from Emery, Forel and Mayr collections. Entomological News 85:257-264. PDF
• Francoeur, A.; Snelling, R. R. 1979. Notes for a revision of the ant genus Formica. 2. Reidentifications for some specimens from the T. W. Cook collection and new distribution data (Hymenoptera: Formicidae). Contributions in Science (Los Angeles) 309:1-7. PDF
• Hunt, J. H.; Snelling, R. R. 1975. A checklist of the ants of Arizona. Journal of the Arizona Academy of Science 10:20-23. PDF
• Smith, D. R. 1979. Superfamily Formicoidea. Pp. 1323-1467 in: Krombein, K. V.; Hurd, P. D.; Smith, D. R.; Burks, B. D. (eds.) 1979. Catalog of Hymenoptera in America north of Mexico. Volume 2. Apocrita (Aculeata). Washington, D.C.: Smithsonian Institution Press, pp. i-xvi, 1199-2209.
• Smith, M. R. 1951c. Family Formicidae. Pp. 778-875 in: Muesebeck, C. F. W.; Krombein, K. V.; Townes, H. K. (eds.) 1951. Hymenoptera of America north of Mexico. Synoptic catalogue. United States Department of Agriculture. Agriculture Monograph 2:1-1420. PDF
• Smith, M. R. 1958c. Family Formicidae. Pp. 108-162 in: Krombein, K. V. (ed.) 1958. Hymenoptera of America north of Mexico. Synoptic catalogue. First supplement. United States Department of Agriculture. Agriculture Monograph 2(suppl. 1):1-305. PDF
• Wheeler, G. C.; Wheeler, J. 1977b. North Dakota ants updated. Reno, Nevada: published by the authors, 27 pp. PDF
• Wheeler, W. M. 1912c. New names for some ants of the genus Formica. Psyche (Cambridge) 19:90. PDF
• Wheeler, W. M. 1913i. A revision of the ants of the genus Formica (Linné) Mayr. Bulletin of the Museum of Comparative Zoology 53:379-565. PDF
• Wheeler, W. M. 1917a. The mountain ants of western North America. Proceedings of the American Academy of Arts and Sciences 52:457-569. PDF