The Blue Forester is a species of Satyrine

Satyrinae

Satyrinae, the satyrines or satyrids, commonly known as the Browns, is a subfamily of the Nymphalidae . They were formerly considered a distinct family, Satyridae. This group contains nearly half of the known diversity of brush-footed butterflies...

butterfly found in parts of Asia. It is known from Sikkim and Bhutan.
This butterfly has a 2.5 to 2.6 inches wingspan. male is a deep indigo blue on the upperside with the margins being paler. The females are darker brown with yellow sub-apical marks. Males hava tuft of black hairs on the second vein where it meets the median vein.