Leptothorax (Dichothorax) pergandei Emery, 1895d: 323, pl. 8, fig. 13 (w.) U.S.A. (District of Columbia). Nearctic.

Primary type information: Type-material: lectotype worker (by designation of Prebus, 2021b: 240). Type-locality: lectotype U.S.A.: Washington, D.C., 9.10 (Pergande), no. 54078 U.S.N.M. cotype. Type-depository: USNM. Type-specimen: USNMENT00922524 (lectotype). (Source: Prebus, 2021b: 240.) Secondary type information: Paratype-material: 12 paralectotype workers. Paratype-locality: same as for lectotype. Paratype-depositories and specimens: MSNG: CASENT0904767; USNM: USNMENT00922508, USNMENT00922509, USNMENT00922510, USNMENT00922511, USNMENT00922515, USNMENT00922517, USNMENT00922518, USNMENT00922522, USNMENT00922523, USNMENT00922525, USNMENT00532783. (Source: Prebus, 2021b: 240.) Type notes: Prebus, 2021b: 240, interprets the code “9.10” on the syntype labels as “September, 1910”, but this cannot be correct as the specimens were described in 1895, and the validity of the specimens as syntypes has never been doubted.