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Thanks, Paul, for this somehow frustrating information. Not so much frustrating, that I probably won't get the exact species of this fly, but more that again I was trapped by this book (Kormann), giving characteristics without a hint on their dependence on the fly's sex.

How do you know it's a female? (or do you really only think so?) Looking at the pictures of the male P. versicolor in the gallery, the eyes of this genus don't seem to give the information that they do about most of the syrphids' sexes.

Greetings
Rupert