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So, I checked all my Onesia from one locality in Austria:

* based on male genitalia: all are floralis / sepulchralis
* vertex can be narrow or broader
* prae IA can be absent, hairlike or present.

In other words: Schumann's external features are unreliable already in these 10 specimens. Now I know what I am doing, I would not rely on them.

Theo