Little bit tricky from this perspective, but I think this is Methona themisto.
Nymphalidae, Danainae, Ithomiini.
http://www.lepidoptera.datahosting.com.br/themisto.htm
http://www.entomologenportal.de/g1475p5099-Methona-themisto.html
http://www.butterfliesofamerica.com/L/methona_t_themisto_specimens.htm
http://en.wikipedia.org/wiki/Methona_themisto
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