This 10-12 mm fly was hovering around a tree trunk at the forest yesterday (northwest Germany). It looks like a Caliprobola speciosa male without abdomen pattern (?).
phil withers wrote:
Perhaps because it's a Brachypalpus ?
That was my next guess. But with these orange wings and so rather slender??? I had Brachypalpus laphriformis here several times, but they looked quite different.