Formica difficilis Emery, 1893 valid
Formica rufa subsp. difficilis Emery, 1893k: 651, pl. 22, figs. 9, 14 (w.q.m.) U.S.A. Nearctic.
  • Wheeler & Wheeler, 1953c: 164 (l.).
  • Raised to species: Wheeler, 1904f: 305; Wheeler, 1904i: 348.
  • Senior synonym of Formica consocians, Formica habrogyna: Cole, 1943a: 389.
Junior synonyms
Citations