Hesperiidae, Pyrginae. "Tough" one. Immediately clear it must be a Quadrus sp. (looking at the "c" on the forewing), and it is either Quadrus cerialis or Quadrus lugubris. Comparing the 2 it is none of them. Look like a mixture of the two. However, looking even more carefully it is clear that it only can be Quadrus lugubris. My arguments: The markings in yours are not so strong than in usually seen Lugubris. The main criteria are the 2 little spots at the apex of the forewing, mostly the "shape" or direction. Looking at the left forewing: In Cerialis it is a clear ">" shaped order, whereas in Lugubris it is the other way round, so "<" shaped, like in yours.
Here are some more pictures to compare (as usual ;-)...):
http://butterfliesofamerica.com/imagehtmls/Pyrginae/06-SRNP-18855-DHJ351634_i.htm
http://www.neotropicalbutterflies.com/Site%20Revision/Pages/SkipperPages/Skippers_Pyrginae_Group2/Skipper_Pyrginae_Group2_Pages/Quadrus_lugubris.html
http://butterfliesofamerica.com/quadrus_lugubris.htm
Cerialis:
http://butterfliesofamerica.com/quadrus_cerialis.htm
http://butterfliesofamerica.com/imagehtmls/Pyrginae/04-SRNP-15266-DHJ303540_i.htm
Note the ">" shaped order of the 3 tiny spots.
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