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Urbanus viterboana
Personally I don't think this one is Viterboana. Look at the 5 spots at the apex of the forewing. In Viterboana there should only the upper 3 ones. There are many other from the same genus which looks almost the same. The one with some additional spots in this area is Urbanus proteus, which I would tend to. But I am not absolutely sure about Proteus. You have to verify!
http://butterfliesofamerica.com/urbanus_...
http://butterfliesofamerica.com/urbanus_...