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This fly resembles Neria cibaria (gallery photos) a lot. Could it be that species? I photographed it this afternoon at Leerdam, Netherlands. It was about 8-10 mm long and was walking on leaves all the time.

Thanks in advance for any help!

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I'd be happy with that identification. The general appearance is right for Neria and the ovipositor sheath typical of Neria. In N.cibaria there is a dorsolateral constriction of the ovipositor sheath as your picture illustrates. It's always worth sticking around and looking for a male; the genitalia are much easier to use for identification and there are frequently 2 or more species in the same location.
Email me and I'll send you my key used in our Dipterists Forum workshop recently.

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Thanks very much for confirmation, Darwyn. I will send you a pm, I would like to have the key.

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