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Ok, I had a very good look.
and I can see 3 humeral bristles in a triangle and small discal setae on the tergite 4, but not on 3, which would imply Periscepsia.
Periscepsia carbonaria is by far the most common species and can be found very late in autumn.
So, that would be my 95% guess.
Beware, it is a lot to ask to give an ID in such a difficult group, not matter how good the pictures !


Theo