Leptothorax (Leptothorax) tricarinatus Emery, 1895d: 321, pl. 8, fig. 14 (w.) U.S.A. (South Dakota). Nearctic.

Primary type information: Primary type material: holotype worker. Primary type locality: U.S.A.: South Dakota, Hill City (T. Ulke). Primary type depository: MSNG. Type notes: Smith, 1952c: 99, points out that the collector was Titus Ulke, “not Theodore Pergande as stated in other publications”.