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Well, Theo, I believe You completely. I was confused by these pictures: http://bugguide.net/node/view/350612/bgimage
If these species occur in different seasons, it is unlikely that they can be confused. Images Bibio lanigerus I also was determined on this forum and they really have met me in early June.
https://fotki.yandex.ru/users/woodmen19/tags/bibionidae