Leptothorax (Leptothorax) longispinosus subsp. laeviceps Buren, 1944a: 287 (w.) U.S.A. (Iowa). Nearctic.

Primary type information: Primary type material: holotype worker. Primary type locality: U.S.A.: Iowa, high Mississippi Bluffs, nr McGregor, 10.vi.1940 (W.F. Buren). Primary type depository: USNM. Secondary type information: Secondary type material: 11 paratype workers. Secondary type locality: same as for holotype. Secondary type depositories: ISUI, LACM, USNM. Type notes: Buren, 1944a says paratypes are also in the collections of “other institutions and individuals”.