The Formicidae (Hymenoptera) of Fennoscandia and Denmark. Author Collingwood, C. A. text Fauna Entomologica Scandinavica 1979 8 1 174 http://antbase.org/ants/publications/6175/6175.pdf journal article 6175 Genus Harpagoxenus Forel, 1893 Harpagoxenus Forel, 1893: 167. Type-species: Myrmica sublaevis Nylander , 1849. Workers and queens. Head large, subrectangular with broad edentate mandibles. Both petiole and postpetiole have strongly developed ventral tooth-like projections. Palp formula 5:3. Antennae 11 segmented. Male. Similar to Leptothorax acervorum but with ventral projecting tooth on postpetiole as in female castes. Antennae 12 segmented. This genus contains at most 2 or 3 palaearctic and 1 North American species living in semi-parasitic dulotic relationship with members of the closely related genus Leptothorax