Hesperiidae, Polyctor sp., it is either Polyctor cleta or Polyctor polyctor polyctor.
http://butterfliesofamerica.com/imagehtmls/Pyrginae/87_Polyctor_cleta_M_082703_KG_Gomez_Farias_3359_AW_i.htm
http://butterfliesofamerica.com/imagehtmls/Pyrginae/Polyctor_p._polyctor_BRASIL_MATO_GROSSO_Cristalino_Jungle_Lodge_14-X-2006_Richard_Hoyer_i.htm
I apologize, but for once, I can't tell you which one it is...
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