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Thanks for your replies.
This mayfly has no flat side to the otherwise round eyes and 3 'streamers' (pardon the amateurish language). But i will look into it further.

I'll look into Palpomyia too, Information on that group doesn't seem readily available for France...

This Flickr photo seems to back up your ID: https://www.flick...FnC-tLAiyt

to be continued...

regards
Gerben