One of the more common butterflies all over Costa Rica is this Banded Peacock, Anartia fatima (my gallery link) and as these two recent photos in my garden show, the top of its wings are a very dark brown & red with a brilliant white while the bottom of the wings are paler or a light brown and red. Of course, as always in nature, there are a few exceptions or variations, but not many in this species. See my gallery linked above. It is another of the many species found only in Central America & Mexico.
¡Pura Vida!