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The bristles on parafacial strongly suggest curvinervis, as does the date.
The arista, yes, I was in doubt as well, it is difficult to judge (for me) from these pics. I'd say the thickened part it too short for trepida and too long for curvinernis, so working theory is we can't see all of the aristal apex.

In any case, trepida in september is no-go, unless climate change messes up everything.


Theo