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hi Theo and Chris,

Yes (clumsy smiley), the first one is B. marci.. ;) (let's keep things simple)

And Crhis, good point!

I don't know this species, looking at the key I think you are right!
I have to look at the other 'Bibio Anglicus' males, which I found before.
Perhabs there are more B. leucopterus between them?