Polistes bischoffi Weyrauch 1937

Based on the material that we have examined, Polistes bischoffi occurs at least in Southern Europe and Turkey from the Atlantic coast of southern France to Turkish Kurdistan (Fig. 11). The northernmost confirmed locality is in the Pannonian region of Austria (Neusiedl am See), followed by several localities in Switzerland where the species occured already in 1927 at the river Versoix near Geneva (individuals RN0170, RN0171). In all other, more northern Swiss sites Polistes bischoffi occurs syntopically (Neumeyer et al. 2011) with Polistes helveticus sp. n. and was not detected before 1992, suggesting a possible recent range expansion due to climate warming.