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Suastus gremius gremius
About 1"
Hesperiidae, Hesperiinae, Suastus gremius gremius.
http://4.bp.blogspot.com/-q39l77AsjYA/Ul...
http://www.butterflycircle.org/LifeHisto...
I guess you found it on a palm, that would match with the host plants of several palm plants.