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Thanks a lot Black,

According to the Dutch checklist you leave me with 8 possibilities.
Looking at the gallery and at former postings I dare to exclude four of them, so if someone would be so kind to blot out another three, we would have a species name (I know this is not a very scientific way to act).
The candidates are : Seri obscuripennis, Protoclythia modesta, Platypeza fasciata and Platypeza hirticeps.

Ben