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Pierella helvina
I thought the wings looked transparent, but when they are closed I see they're not. About 5 cm across.
Nymphalidae, satyrinae, Pierella helvina incanescens.
http://en.wikipedia.org/wiki/Pierella_he...
The wing patterns are typical to Cithaerias species, which are invariably transparent-winged. Couldn't find any species resembling this one though.