Formica pratensis unicolor Ruzsky, 1926 junior synonym of current valid taxon Formica lugubris Zetterstedt, 1838
Formica pratensis subsp. unicolor Ruzsky, 1926: 110 (w.) RUSSIA. Palearctic.
Primary type information: Primary type material: holotype worker. Primary type locality: Russia: Tobolsk, Surgut, 13-21.vi.1913 (S.M. Chugunov). Primary type depository: ZMUM.
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