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Hi Eric

I have never seen a Heringia too. That is great and exciting found for me. Thank you for your reply to my posting!

I'm not so advanced that I can work my way through a key, especially when you're not supposed to recognize and/or correctly evaluate something but I have the book of van Veen (2010): Hoverflies of Northwest Europe.
The only thing I can see well are the antennaes. The Key starts with them and ends by Heringia (Heringia) heringi when the 3rd segment is elongate, 2-3 times as long as broad. I'll add a cut out pic of the antennaes. What do you think about?

Kind regards, Brigitte