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Hello Paul & Rui Andrade,
I have some experience with identifying Chorisops from both North-West and Southern Europe. I cannot make out the terminalia from the photo. But the abdominal marking concur perfectly with C. tibialis. See also: https://www.researchgate.net/publication/258065960_Updated_Italian_checklist_of_Soldier_Flies_Diptera_Stratiomyidae
Greetings,
Ectemnius