Could also be Heliconius melpomene rosina, Postman. You can't separate them from an open wing shot, you need a ventral view. And do not forget all the variation within both species. Do you have one? Otherwise I would go with Heliconius sp. with mentioning both candidates in the description.
http://www.butterfliesofamerica.com/heliconius_erato_petiverana.htm
http://www.butterfliesofamerica.com/heliconius_melpomene_rosina.htm
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