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Hello,
On September 17, 2019 in the south of France - 5,5 mm.
This fly was watching a Prionyx kirbii trying to excavate its nest. The dipteran followed it quite closely in all its movements.
Could it still be Taxigramma?
A Prionyx kleptoparasite fly?
The wing venation and perhaps the colors shows that it is however another species than that of my subject https://diptera.info/forum/viewthread.php?thread_id=91784