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I understand better now ! With this post it seems that my female seems to lead towards varipes rather than lanigerus but I never saw a single male Bibio varipes (yet) in more than 6 years... that where I understand the current difficulties with the females of Bibio johannis/lanigerus/varipes without at least a pairing with a male
So I will register this female as Bibio johannis/lanigerus/varipes

Thanks you so much, Theo ! :)