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Yesterday we found a large patch of Primrose flowers and nearly every one had one of these flies on either the leaves or the flowers. I didn't see them on any other flowers so I assume they specialise on Primroses. This was in mid Sussex on a sunny afternoon. Any help much appreciated!
A species of Bibio, which are widespread at this time of year and probably just coincidence that you were seeing them on primroses, though I have noticed they will collect on yellow flowers of gorse, as well. Likely to be B. lanigerus from the look of it, but best done to species via a specimen.
Are there keys for Bibio?
I'm seeing quite a few which rather look like B. johannis to me but I'm only guessing really.