The Hewitson's Olivewing (Nessaea hewitsonii) is a species of butterfly of the Nymphalidae family. It is common in a broad range of the Amazon basin including the eastern slopes of the Andes mountain range. It is found in high evergreen tropical forest, semi-deciduous tropical forest, and riverine forest.[2] The length of the wings is 33–40 mm for males and 36–41 mm for females