Pogonomyrmex occidentalis valid U.S.A. (Colorado). Nearctic.
Cresson, E. T. Sr. 1865b. Catalogue of Hymenoptera in the collection of the Entomological Society of Philadelphia, from Colorado Territory. [concl.]. Proceedings of the Entomological Society of Philadelphia 4:426-488.   123940

Pogonomyrmex occidentalis comanche obsolete combination U.S.A. (Texas). Nearctic.
Wheeler, W. M. 1902d. New agricultural ants from Texas. Psyche (Cambridge) 9:387-393.   129970

Pogonomyrmex occidentalis owyheei obsolete combination U.S.A. (Idaho). Nearctic.
Cole, A. C., Jr. 1938a. Suggestions concerning taxonomic nomenclature of the hymenopterous family Formicidae, and descriptions of three new ants. American Midland Naturalist 19:236-241.   123689

Pogonomyrmex occidentalis ruthveni synonym of Pogonomyrmex occidentalis U.S.A. (Nevada). Nearctic.
Gaige, F. M. 1914a. Description of a new subspecies of Pogonomyrmex occidentalis Cresson from Nevada. Proceedings of the Biological Society of Washington 27:93-96.   125407

Pogonomyrmex occidentalis subnitidus obsolete combination U.S.A. (California). Nearctic.
Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zoologische Jahrbücher. Abteilung für Systematik, Geographie und Biologie der Tiere 8:257-360.   124591

Pogonomyrmex occidentalis utahensis synonym of Pogonomyrmex occidentalis U.S.A. (Utah). Nearctic.
Olsen, O. W. 1934. Notes on the North American harvesting ants of the genus Pogonomyrmex Mayr. Bulletin of the Museum of Comparative Zoology 77:493-514.   127623