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Catonephele acontius
Parque das Aves, cataratas Iguaçu (Brasil).
Catonephele mexicana is a Central American species. This is Catonephele acontius. Look at the red spot on the forewing. In Mexicana this spot is extending to the margin, in yours not.
http://fr.wikipedia.org/wiki/Fichier:Cat...
http://images.peabody.yale.edu/emu/37/74...
http://www.butterfliesofamerica.com/ih01...
Mexicana: http://www.butterfliesofamerica.com/L/im...