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Phoebis sp.
This a medium sized butterfly and about 2" round.
Tropical dry forest in NW Costa Rica 4.5 months into the 6 month dry season.
Looks pretty tattered, but I'm guessing it's a cloudless sulphur.
http://neotropicalbutterflies.com/Site%2...
http://www.projectnoah.org/spottings/871...