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Ok, thank you very much for your answer John !

I've seen there were many synonyms of Pandelleia sexpunctata but I thought Theo was saying that Peter Tschorsnig told him both species were synonyms in this thread but now it's clear with your explanation !

So, is there a key to separate one from the other or do you know if this fly is Pandelleia sexpunctata or Pandelleia otiorrhynchi as both can apparently be in my area ?

In an old french document from Dr J. Villeneuve, there's a description of Pandelleia alpicola (one of Pandelleia sexpunctata's synonyms) that doesn't match on every point so this one might be Pandelleia otiorrhynchi, what do you think ?