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

Primary type information: Primary type material: syntype workers, syntype queens, syntype males (numbers not stated, “numerous specimens”). Primary type localities: U.S.A.: Colorado, nr Colorado Springs, Manitou, vii.-viii.1903 (W.M. Wheeler) (invalid restriction of type locality by Creighton, 1950a: 278; no lectotype designated), U.S.A.: Colorado, nr Colorado Springs (Cheyenne Creek, Red Rock Canyon, and Willams Canyon), vii.-viii.1903 (W.M. Wheeler). Primary type depositories: AMNH, LACM, MCZC.