Borboleta marfim (Ivory butterfly)

In my book there is a Eunica margarita eburnea and Eunica margarita margarita, which obviously are separated later into 2 different species. And there might be a distinctive feature for separating the two: Looking at the apical region of the forewing, you can see some slight scalopped wing in Margarita and no scalopping but straight forewing in "my" E. margarita eburnea, which is now E. eburnea. I can't really judge the apical wing form in your shot due to the perspective. My eyes see some tendency for scalopping.

Eburnea and Margarita are actually very close, might even be subtypes. I will do a recheck. Burnea is quite common, Margarita probably less common. I am a little bit confused about the stronger dark veins on the forewing in Eburnea, which yours has not. At least the genus was correct ;-)...

YES!

Nymphalidae, Biblininae. Eunica margarita. One of the "nastiest" ones I ever IDed. I knew it is not a skipper, for that the head was too small. I then decided it must be a Satyr. It was not, because I didn't found any reasonable species. And finally I found it where I never thought it would be: Eunica, Purplewings!! Ts, ts, I couldn't believe it!! http://www.mundobutterfly.com.ar/Html/Margarita.html