Pogonomyrmex barbatus nigrescens Wheeler, 1902 junior synonym of current valid taxon Pogonomyrmex barbatus (Smith, 1858)
Pogonomyrmex barbatus var. nigrescens Wheeler, 1902d: 389 (w.) U.S.A. (Texas, New Mexico). Nearctic.
Primary type information: Type-material: 16 syntype workers. Type-locality: 14 workers U.S.A.: Texas, Eagle Pass (‘a lady’, donated by A.M. Ferguson), 2 workers New Mexico, Mesa Negra, San Ildefonso (E.L. Hewitt & R. Reynolds). Type-depository: MCZC (probably also in AMNH, LACM).
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