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Looks like Adoxomyia dahlii, but this species and the whole genus is not known from Spain or Portugal... on the other hand this is one of the most difficult genera, with lots of species described in a sloppy way, nothing comprehensive and I am not sure which characters work.. But at least dahlii is a widespread species with yellow knees, and long elongate antennae... so that is the best match I can come up with..
Cheers
Martin