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I don't have an opinion on this matter, other than that Nyctia halterata is an extremely variable species.

Rohdendorf in Lindner gives only one Nyctia species with the following remark

"Remark by B. Herting: Specimens from the Mediterrean show, contrary to the description above, a clear, grey-white dusting, in males especially at the anterior margin of tergite 5, in females more on the mesonotum (shoulders and region of DC). Topcell always stalked. It remains an open question, whether we are dealing with a separate species."

OF course, this is written years ago.


Theo