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Oh, my contribution did disapear. In brief: I cannot contribute anything about the bevavior. Probably it is a mating or pre-mating behavior. About the species: All specimens on the photos are males of a Polistes, most probably of P. gallicus, but P. dominilus is also probable. (fore male recognitzion, see also number of gaster segments: male 7, female 6, but antennal character is also fine, and face in Polistes males is all yellow).

Regards, Christian