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Hi,
These small Bibio males drive me crazy! Many of them sit around on the grasses, females are not seen. I tried so hard to find a B. varipes male for my female (https://diptera.i...d_id=94658) but the result is frustrating... The males I checked seem to belong to the same species. I even translated the key by Verbeke (1971) to not overlook a helpful character, but the flies key out as B. johannis. They are red-legged, and the hairs of head, thorax, legs and body are completely black. Though I find the wings a bit brown and the metatarsus III a bit long for johannis, I think I recognize a johannis character of tibia III: a longitudinal row of black dots on a brown stripe (the latter being not mandatory). I marked it with an arrow in the first picture.
I took two series of photos, one without flash light to avoid reflection (but of less quality then) and one with flash. The locality was the same: southwestern germany, about 20 km west of Stuttgart, edge of a small wood.

This is the first male from May 5th, without flash.