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Here is the link to a wikipedia photo of a couple of Bibio cf. pomonae:
https://ca.wikipedia.org/wiki/Fitxer:Bibio_cf_pomonae_fg01.JPG

Looking at wing venation, the male has r-m vein a bit longer than Rs ("anglicus type")
Looking at wing venation, the female has r-m shorter than R1 ("hortulanus type")

So is this perhaps an interspecific coupling?

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I'd rather bet on B reticulatus/varipes for this couple

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Great
It would be nice somebody correcting the wikipedia entry.
It would be good if someone could correct the Wikipedia entry.
On the other hand, I suppose that this type of coupling (which I had never observed in diptera) does not produce fertile offspring.
Thanks for the comment

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I've added a comment to the picture. Hopefully the maker of the picture improves the info.

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Great, Weia, thanks

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I think that it is a couple of Bibio reticulatus. All veins coloured, costal cell light, as rest of wing membrane, pterostigma well-marked, strongly contrasting. Pilosity of male agrees also with this species.

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B. reticulatus is correct, I think.
Compare copula reticulatus:
https://diptera.i...d_id=98867
and varipes:
https://diptera.i...d_id=98868

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Reticulatus is better than pomonae, so I changed the name on all wikipedia's... Anyone can do this by the way.

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For me, it's a solved case. Considering the image provided by eklans, in this species (which is absent where I live, in southern Europe), the male has a venation with the Rs vein shorter than r-m (which I call the ‘anglicus’ type), whereas the female has the Rs vein shorter than r-m (which I call the ‘hortulanus’ type).
This contradicts what Duda's key (1930) says for the female. This characteristic is not used in other keys.
I will update that in the wiquipedia comment.