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Does somebody know how valuable is the following feature, which is mentioned in Stuke (2010):

* face golden dusted... Hyadina guttata (Fallen, 1813)
* face silver dusted.. Hyadina humeralis auct., nec. Becker, 1896

Personally, I would say the face in these pictures is silver dusted (favouring humeralis), but that would contradict the clear patches (favouring guttata).