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date: 6 June 2019; location: in Hamburg, Germany, in my garden which is close to a park area with trees and a pond;
a female of Calobata petronella?
Thanks for ID help!
Best regards, Volker

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2nd picture

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3rd picture

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A tricky one Volker.
For Calobata petronella one would expect to see brown humeri. A vague suggestion of that in the top picture but not in the third one.
The ovipositor shape could be a bit of a clue, in C. petronella it starts bulbous then narrows. I'm more inclined towards Neria cibaria where the ovipositor is black with a kink.
Take a look at Calobata petronella http://micropezid...my/term/15
and Neria cibaria http://micropezid...my/term/20

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Thanks a lot, Darwyn, for ID help with excellent explanations!
Thank you also for the link to the Micropezidae website.
I attached another picture where the whole ovipositor is visible.
Best regards,
Volker