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Hello Miguel,

male genitalia are as difficult to match to drawings as female ovipositors.
you must dissect the genitalia to create a better view.

As a rule, you must always look at the wing to eliminate P. pediculata (pseudorudis).
You could spend hours documenting a Pollenia that turns out to be pediculata. A simple look at the wing will save alot of time and misery.
I've all ready added a photo of this wing to the gallery:
https://diptera.i...o_id=10761

Then, you need to look at the palpi to eliminate the few species with orange/yellow palpi.
If the palpi are black/dark with a pale tip, then you can proceed with other features.

As for genitalia, you need perfect dorsal and perfect lateral views of the cerci and surstyli.
You also need perfect dorsal and perfect lateral views of the aedeagus.
I've attached a photo to illustrate this process.
You need to view the genitalia in a manner which matches the drawings of Dr. Rognes.
Also read the text associated with the genitalia in his pdf documents.

Tips: the aedegus is attached to the surstyli by a thin strap-like appendage.
you can break off surstyli if you try to pull the aedeagus to separate it.
the thin strp must be clipped with scissors or a scalpel.

it is extremely difficult to view the aedeagus in perfect dorsal once it is removed from the cerci/surstyli.
it is better to view it in perfect dorsal while it is still attached. you've already shown it in your photos so you can skip this view.

Best wishes,
John