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Arctiidae, Pericopinae, Dysschema sp. for sure. Not it's getting tricky. Yours looks similar to Dysschema paracelsus, but it would not be serious to call this one Paracelsus from only a single shot:
http://www.flickr.com/photos/artour_a/26...
There are at least 20 other Dysschema sp. which look similar to yours in Costa Rica.