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Pieris napi
This butterfly, usually whitish in color, shows streaking green or grayish scales corresponding to the veins of the lower part of the rear wing. The wings are dark spots on both sides, more pronounced in the females (sexual dimorphism). Generations developed during the summer have spots wing less pronounced than spring, and the ribs appear thinner. In some alpine areas, the tops of the ribs males have very marked, and those of the females are completely sprinkle of brown.
It's a Palaearctic species, widely distributed more or less throughout Eurasia and North America, is also found in Finland, in the Jura Mountains, in the Carpathians and the Caucasus. Which is widespread throughout Italy. It's live in the bush, uncultivated areas, or in the gardens, hedges, river banks and wetlands, from sea level up to 2500 m altitude in central Europe, and up to 2600 m in Italy.
Thanks Bayucca, it's really hard to distinguish, it would a few more photos, unfortunately I have only this one... Looking carefully wings and patches of color, I think you're right and that it's a Pieris napi!
Tricky one! Looking at the edge of the wings I do not think it is Pieris rapae. The black patch should be quite "rectanglar". Pieris brassica would have quite a sharply and roundly black "triangle". Yours seems to have some small spikes at the border which would match for Napi. I can also see some greenish white, however, these are not as consistent as usually seen. This might be due to seasonal forms. Size is at this time of the year not always a criteria for separation. A large Small White might be larger than a small Large White...
I must admit, that the most common ones are sometimes the most tricky ones to determine. What do you think??
http://www.123rf.com/photo_7567375_femal...
http://r.a.r.e.free.fr/interactif/photos...
http://www.rutkies.de/schmetterlinge3/Pi...
http://www.arthropodafotos.de/dbsp.php?l...
Rapae: http://r.a.r.e.free.fr/interactif/photos...