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Greta sp.
I am very sorry not to be able to contribute to this discussion. But, in the other hand, I feel glad for bringing to you what seems to be a good chalenge. Keep the wheels turning, pals. ;-)
I agree with Greta (almost sure), but it is not Greta polissena umbrana, which is not in Brazil (CR and Panama). First I doubted if Greta would even be in Brazil. There are some species in Ecuador, Peru, Colombia nd Venezuela. Unfortunately the BOA website is out of order or in repair, so there is no access to the Greta files from there.
Ismael, I'll take your sugestion, thank you. Thank you too, FlyEmile, for your interest.
Looks more like Polissena Clearwing (greta polissena umbrana) http://butterfliesofamerica.com/greta_po...
I dont think this one could be a greta oto, this one doesnt have a white line and the wings have more transparent holes http://www.projectnoah.org/spottings/713...