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Thank you. I compared the description with this photo and another one I took at another specimen on May 2nd 2020 in Bazzano (AQ), Italy. I tried to look for similarities, but I'm no expert and I probably interpreted some things wrong, however, the features that in my opinion match are:

-Tufts of white hair at the base of the wing. (Ciuffi di peli bianchi […] alla base dell'ala).
-A large tuft of white hair at the tip of the subcosta (un grande ciuffo all'estremità della subcosta).
-(...) before the tip of cu_1b, where there is a big tuft of white hair similar to the one on the subcosta. ([…] prima dell'estremità di cu_1b, dove vi è un ciuffo grande simile a quello sulla subcosta).
-White fringe of the tip of r₂ to the tip of cu_1b and between cu_1b and a, not pure white in colour. (Frangia alare bianca dell'estremità di r₂ all'estremità di cu_1b, e poi fra cu_1b ed a, peraltro di un bianco non completamente puro.).

I'm not so sure of all the other features regarding the habitus and the wing venation because from the picture I wasn't able to read well the subscripts of the wing veins' names.

The last feature that seems to match comes from the Antennae description: segments of the flagellum of decreasing size towards the tip and "flask-shaped" (Articoli del flagello di dimensioni decrescenti verso l'apice, a forma di fiasco.).

This species is very common especially in May, so I will definitely try to take better photos from other angles whenever possible.