Formica difficilis Emery, 1893 valid
Formica rufa subsp. difficilis Emery, 1893k: 651, pl. 22, figs. 9, 14 (w.q.m.) U.S.A. (Virginia). Nearctic.
Primary type information: Primary type material: syntype workers, syntype queens, syntype males (numbers not stated). Primary type locality: U.S.A.: Virginia (T. Pergande) (by restriction of Wheeler, 1913i: 478). Primary type depositories: AMNH, MCZC. Type notes: Other original syntype locality: U.S.A.: New Jersey (T. Pergande), later designated as type locality by Creighton, 1950a: 500.
Junior synonyms
Obsolete combinations
Citations