Collingwood, C. A., 1979, The Formicidae (Hymenoptera) of Fennoscandia and Denmark., Fauna Entomologica Scandinavica 8, pp. 1-174: 77

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Genus Formicoxenus  HNS  Mayr, 1855

Formicoxenus  HNS  Mayr, 1855:413.

Type-species: Myrmica nitidula Nylander  HNS  , 1846.

Worker and queen. Small, shining, narrow bodied ants. Antennae 11 segmented; palp formula 4:3. Postpetiole with peg-like ventral process directed forward.

Males. Apterous, ergatoid without wing sclerites. Antennae 12 segmented. Postpetiole as in female castes.

This is a palaearctic genus with 2 species only; a similar species Leptothorax diversipilosus M. Smith  HNS  , occurs in North America.