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Thank you Jan, Susan and Joke for your reaction,

I found this fly yesterday in the afternoon in the southpart of the Amsterdam forest.
There is a path with young growing Fraxinus excelsiors, from the ground up to the sky.
There you can see many kind of flies, sunning, flying and doing much more..

I took several pictures, also more from the side.
You can see the yellow coloured basicosta and white hairs on the upper calypter.
Some other characteristics you called, I cannot find yet. (I am struggling with all these terms and things..)
But it was a wonderfull nice green fly, obvious.. and I was happy I saw something new next to the Calliphora vicina's I saw the last time.
But I didn't realise that this fly was so rare?