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In the northern Alps of Switzerland we observed a mixed ant colony of    Formica   truncorum    Fabricius, 1804 and    F.   fuscocinerea    Forel, 1874 at the foot of a schoolhouse wall in the built-up centre of the small town of Näfels (canton of Glarus). Based on the fact that the habitat is favorable only for    F.   fuscocinerea    and that    F.   truncorum    is a notorious temporary social parasite, we conclude that in this case a colony of    F.   fuscocinerea    must have been usurped by    F.   truncorum   . This is remarkable, as it is the first reported case where a colony of    F.   fuscocinerea    has been taken over by a social parasite. We consider the observed unusually small workers of    F.   truncorum    to be a starvation form. This is probably due to the suboptimal urban nest site, as this species typically occurs along the edge of forests or in clearings.

alpine entomology

First observation of an ant colony of    Formica   fuscocinerea    Forel, 1874 invaded by the social parasite    F.   truncorum    Fabricius, 1804 (  Hymenoptera  ,   Formicidae  )