Everyone misidentifies this as a Riodinidae sp. when they first see it, even experienced neotropical lepidopterists. It is not very common. This species inhabits rainforest at altitudes between about 100-1000 m.
Andrew Neild, author of The Butterflies of Venezuela helped me identifying this butterfly.

Minca area, Sierra Nevada de Santa Marta, Colombia, 24 October 2014