Leptothorax (Mychothorax) acervorum subsp. crassipilis Wheeler, 1917a: 513 (w.q.m.) U.S.A. (Colorado). Nearctic.

Primary type information: Type-material: syntype workers, syntype queens, syntype males (numbers not stated, “numerous specimens of all three phases”). Type-locality: U.S.A.: Colorado, nr Colorado Springs, Manitou, vii.-viii.1903 (W.M. Wheeler) (by restriction of Creighton, 1950a: 278). Type-depositories: AMNH, LACM, MCZC. Type notes: Other original localities include Cheyenne Creek, Red Rock Canyon, and Willams Canyon, all Colorado, nr Colorado Springs.