Polyergus rufescens subsp. breviceps Emery, 1893k: 666 (w.) U.S.A. (Colorado). Nearctic.

Primary type information: Primary type material: lectotype worker (by designation of Trager, 2013: 511). Primary type locality: lectotype U.S.A.: Colorado, Breckenridge (T. Pergande?) (invalid restriction of type locality by Creighton, 1950a: 588; no lectotype designated) Primary type depository: MHNG. Primary type specimen: CASENT0179559 (lectotype). Secondary type information: Secondary type material: paralectotype workers (number not stated). Secondary type locality: same data as holotype, U.S.A.: South Dakota (no further data) (T. Pergande). Secondary type depository: unspecified but presumably MHNG, MSNG. Type notes: 1) Other original syntype locality: U.S.A.: Colorado (no further data) (T. Pergande). 2) Smith, 1947g: 157, gives South Dakota data as Hill City, vi.1890, no. 142 (ex coll. T. Pergande).

Infrasubspecies

• P. r. b. fusciventris Wheeler, 1917
• P. r. b. montezuma Wheeler, 1914
• P. r. b. silvestrii Santschi, 1911
• P. r. b. umbratus Wheeler, 1915