Polyergus rufescens umbratus Creighton, 1950 junior synonym of current valid taxon Polyergus mexicanus Forel, 1899
Polyergus rufescens subsp. umbratus Creighton, 1950a: 560 (w.) U.S.A. (California). Nearctic.
Primary type information: Primary type material: syntype workers (number not stated, “numerous”). Primary type locality: U.S.A.: California, Brookdale (H. Heath). Primary type depositories: AMNH, LACM, MCZC, USNM. Primary type specimen: CASENT0172897.
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