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I tried Ceretti's key and thought the best fit was Exorista decidua(*), which is recorded from France and Spain but not Italy. This is based on the key, not on experience with European Exorista. I don't know what the species looks like.

(*) "Occhio con pubescenza rada e più corta", "Superficie dorsolaterale dei tergiti 3, 4 e 5 con pruinosità rispettivamente su 1/2-2/3, circa 1/2 e 1/3-1/2 della loro lunghezza"