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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?