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Hej Piet
Ok, that makes sense! I have read the descriptions of the two species but never seen this mentioned. O. rara is rare but widespread in the area and seems more likely.
In addition everything seems to fit with O. rara, even the more rounded dots on tergite 3. I will keep the collected specimen save for documentation and call it O. rara, thanks to your helpfull remarks!
Regards Ken