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Harrisina sp.
Zygaenidae, might be Harrisina sp. and Harrisina metallica, the all black form was formerly called Brillans, but is know included in Metallica:
http://bugguide.net/node/view/284842
http://bugguide.net/node/view/311479/bgp...
http://www.flickr.com/photos/bob_barber/...
There is another one:
http://bugguide.net/node/view/392448
Actually there is not much info about Zygaenidae of Costa Rica. Please, verify and I will check them as well once more.