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Greta oto
The glasswing is so named because of its gloriously transparent wings.
A migratory butterfly, Greta oto is found in virtually all habitats in Costa Rica, including disturbed ones. It is often spotted passing through open areas, and sometimes visits gardens in the Meseta Central region.
This is definitely not Greta morgane oto. ID not possible from this shot. Might be Pterynomia sp. or Episcada sp. (or some other).