Dynamine postverta, the Mylitta greenwing or four-spot sailor, is a butterfly in the family Nymphalidae. It is found throughout most tropical and subtropical areas of Central and South America, from Mexico south to Argentina and Paraguay.[1] The habitat includes primary rainforests, humid deciduous woodlands, scrubby grassland and farmland at altitudes up to about 900 metres.
The larvae feed on Dalechampia species.
The following subspecies are recognised: