In Hong Kong this butterfly is observed throughout the season except January and February.
When I visited to small town in Lantau island, I walked through near Mango tree with about six feet high and then a large Nymphalidae butterfly was coming here with high speed. The butterfly was flying around the tree for several seconds and I understood that she intended to lie her egg on the leaf of Mango, their host plant. After one minutes continuous flying she stopped on the leaf of Celtis tree and at last I succeeded to take the photo. The wing design of female is specified with clear white band across the forewing.
There I also encountered with male of this species. But he flied with more high speed than that of female, so I failed to take the photo.

[Distribution]  throughout the south-east Asian region