"Species of this group are believed to be temporary social parasites of other species of
Formica. The female in some way is adopted by workers of the host species. Host workers may remain in the colony after the intruding queen has established her own brood, but the host workers eventually die. Most species are found in open woods or meadows. The nests are usually of the thatch type, but the thatching is normally scattered about the nest openings and appears as a flattened disc."
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