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Anthanassa sp.
Personally I don't think it is Alceta, since the spots and patches are different. The big round spot at the base of the forewing is almost melted together with the big patch next to it. I am not even sure about Drusilla, might also be Frisia. If you look at the following links you can see the differences in the several species. You have to look very carefully and you see them, meaning there are almost none differences, even between Frisia and Drusilla.
http://www.butterfliesofamerica.com/L/ih...
http://tolweb.org/Anthanassa_frisia
http://www.butterfliesofamerica.com/L/im...
http://www.flickr.com/photos/mateo_gable...
http://www.flickr.com/photos/41515403@N0...
http://www.flickr.com/photos/jcsousacoel...
At first sight I also would have said: Anthanassa drusilla, but I amnot sure. Looking at Anthanassa frisia dubia I am in doubt. On the other hand Dubia should only be in coastal areas, so the location of this shot is probably not really coastal.