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@Ben, thanks for the tip! I'll have a look at the German site.

@David,

This insect was found in herbs along a small road on a walk through what could best be described as a rural, small-scale patchwork landscape with agriculture, meadows and forests of an old estate. Location approx. North 52d16'45'', East 6d41'42''.

If it's tropical, I have no idea how it got into the Netherlands...

Wim