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As far as I can tell:
The Dutch list once had Erax punctatus. Later reserach showed that the correct name should have been Erax punctipennis. Other research showed that Erax punctatus was a junior synonym of Erax barbatus. So I think the correct name for the Dutch species is E. punctipennis and that records for the Netherlands of E. barbatus are based on the (incorrect) older records of E. punctatus. I do not know about other countries but I assume that some countries will have both species, barbatus and punctipennis.