Posted by nick upton on 10-09-2020 17:05
#1
30.7.2020 7mm Dorset Heathland UK
I think this may be Metopia argyrocephala based on the silvery frons. Several of these flies were hanging around the nest entrances of Beewolf wasps (Philanthus triangulum) which were busy stuffing their nest burrows with paralysed Honeybees. Metopia argyrocephala is a common keleptoparasite of ground nesting bee and wasp nests in souther England, but can I be sure of the ID from this photo?