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I'll need more experience or the fly itself to give a definite ID. For the moment it is keyed out as C. lacteipennis without too many doubts (the only Dexiopsis with black femora, only yellow at extreme tip). Description of this species in my documentation match to this one : bluish-grey dusted species, female with 3 dark stripes on scutum and conspicuous spots on tergite 3 and 4, black antennae and palpi, parafacial as wide as flagellomere, upper postocular setuale with a supllementary row behind. However, I don't know this Coenosia, and I could be mistaken or it could exist another similar species in southern Europe...