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This was in Iceland, where the only 3 bibionids on the list are
Bibio nigriventris, Bibio pomonae, Dilophus femoratus

But comparing to Falk's Flickr accounts (https://www.flick...177517531/)
.... this seems it must be B.longipes, which would be new for Iceland it appears.

Can anyone confirm?

Found in Kopavogur, Reykjavik, Iceland - October 2021
By the sea

Thanks!