small white

Wonderful photos =) Looks like a Pieris rapae to me as well. We (some graduate students and I) created a citizen science project to look at the genetics of this butterfly from across the world - pierisproject.org. If you would be interested in helping (collect a few cabbage whites), we would love to have a few individuals from Italy (we don't have any from there yet). The butterfly has invaded into most regions of the planet and we are trying to reconstruct how it spread across the world (this species is now probably the most abundant and widespread butterfly on the planet!). Also, if you are interested we could post some of you photos on our website.

Looks for me like a "Small white". http://en.wikipedia.org/wiki/Small_White