This is a female.
David Geale, an expert on neotropical butterflies and particularly on the species in Tatamá National Park, helped me identifying this butterfly. I was very fortunate to meet David at the Montezuma Lodge in Tatamá National Park at the time we were visiting. He told me that it he had never seen a Salatis species and it therefore could be an undescribed species. They are poorly known and probably al least partly nocturnal.

Montezuma Lodge area, Parque Nacional Tatamá, Risaraldas, Colombia, 27 June 2015