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Thank you! What are the characteristics of this cryptic species? I checked in my archive and noticed that I have several photos of Dilophus. Some in particular were taken in June in the same area as this Bibio, unfortunately they are not very good as all the photographed individuals were stuck in a spider's web.
Other photos of Dilophus I took near L'Aquila in the last three years include an early spring species (identified here in the forum as D. humeralis/antipedalis) and an autumn species with black males and orange/yellowish females.