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Henrik, as you don't get any reply to your questions I am going to give you my opinion although probably I shouldn't ;) as I am not truly an expert.

I am used to seeing Stomylomyia tenella here in Spain. The keys separate this species from S. europaea by the distictive greyish longitudinal stripes of mesonotum and white tomentum on the first abdominal segment (all these lacking on S. europaea).

Your species seem to have very diffuse grey tomentum on mesonotum and no white tomentum at all on the first abdominal segment. So, I am inclined to think it is S. europaea. But I have never seen this species alive neither I have material to compare with :( so I cannot give a positive ID. Sorry :|

I am adding a picture of a male Stomylomyia tenella from Spain. The features the keys mention can be seen in this picture. Hope this is of any help. Wish you luck and you get the reply of a real expert in Bombyliidae :) I only have the Iberian species reasonably under control.