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Ok, big thanks! I never had heard before about "pollen" as a feature of an insect body. I suppose that are powdery pruinescence, and then I think that it's clearly yellowish more than grey, what would lead to vote maybe for californiae better. In my images I'm unable to see smaller bristles, only bigger setae...
I think that (being not much prudent, haha) I can tag it Archytas cf. californiae :) Thanks a lot!