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Callimormus radiola
900 meters elevation, on the Caribbean slope.
Tribe Moncini, maybe Apaustus gracilis.
With Apaustus gracilis you were really very close. Take a look at the colors of the antennae. Apaustus gracilis has complete black antennae tips and the markings/venetion seem in my eyes being stronger and slightly "thicker" compared to yours:
http://butterfliesofamerica.com/apaustus...
That's why I think it is Callimormus radiola. Please, looks at these pictures to compare the antennae with the whitish part at the end of the club and the markings:
http://butterfliesofamerica.com/images/H...
http://butterfliesofamerica.com/images/H...
Here is again an Apaustus gracilis to compare:
http://butterfliesofamerica.com/images/H...