Clearwing butterfly

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.

You are welcome :)

http://www.neotropicalbutterflies.com/Site%20Revision/Pages/Nymphalidae_Pages/Ithomiinae/Nape_ith_Ole_Gody/Pages/Greta_polissena.html

Looks more like Polissena Clearwing (greta polissena umbrana) http://butterfliesofamerica.com/greta_polissena_umbrana.htm

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/7136366

beutiful,nice one asergio