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Gorgythion begga
It is not just a hint, Argybee. Depending on the sun, they shine like a brand new coin.
There are severa of this species around. Most call them G. begga/beggina/vox without any specification. I think yours is according to my link more Begga than Beggina.
http://www.faunaparaguay.com/pyrginae.ht...
http://butterfliesofamerica.com/t/Gorgyt...
Geographical ranges are not really helpful...
Begga is found in Brazil and should be found in your area:
http://www.nic.funet.fi/pub/sci/bio/life...