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Thank you Gerard for that information!

Now I think then that the first one cannot be P. nielseni, as the shape of the swollen section on the tarsus is different to the second fly which does fit P. peltatus (or nielseni) well. But as you say, nielseni is more rare.

I do have flies in my location which are much rarer than P. nielseni though!

Where does that leave us? :|