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I'm afraid I am stuck with this one.

To my knowledge, only acutangula, deceptoria, atramentaria and umbratica are listed to be present in France. I tried using this key to sort things out, but with no luck.

I would discard acutangula because wing cell r4+5 is not with a short petiole.
I first discarded deceptoria because tergites 1+2 to 4 usually were not with a clear yellow posterior margin and more and less red lateraly.
I would also discard atramentaria because the body is not entirely black.

We also noticed that this specimen has crossed post-ocellar setae, do you think this can help in any way?

Otherwise, I will stay at Stevenia sp.

Thank for your help!

PS: there is also two species synonyms of Stevenia listed in France: Paykullia insularis and partenopea