Polistes biglumis belongs to the subfamily Polistinae (paper wasps).
They can be recognized by the way they fly: the legs hang obliquely downwards, unlike most other wasps that fold the legs under the body in flight.
Polistes biglumis can easily be confused with the European Paper Wasp (Polistes dominulus).
However, Polistes biglumis can be recognized by its almost completely black antennae.
In the European Paper Wasp these are orange-red.

Nature Reserve Schlangenberg, Breinigerberg, North-Rhine Westphalia, Germany, 7 August 2022