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Photo 13-4-2018, Bergen, the Netherlands.
I thought Bibio lanigerus, but when I look at Dutch information for a male I doubt if I just look at the metatars. ( https://www.nev.n...1997-2.pdf )

Metatars 3 slim, about 4 times as long as wide (fig. 6) ................................... ............................ Bibio varipes
Shined bright red. Metatars 3 slightly thickened, about 3 times as long as wide (fig. 8) ................ Bibio lanigerus

Regards and thanks, Thijs