It is Caltoris cahira austeni. ID points 1 female ,2 FW with 2 cellspots 3. HW without any spot.
The FW with whitish spots ; 2 FW cellspot. A spot in space 1b indicating a female.
Underside dark brown .
In photos colour is very variable & confusing.
Caltoris cahira UnH dark chocolate usually but variable.
Female Singapore.Federick.
http://4.bp.blogspot.com/-7l1dr3n_gK...ris+bromus.jpg
Ssp austeni is also found in Taiwan .
Taiwan male & female.
http://dearlep.tw/images/Papilionoid...00%20(109).jpg
https://encrypted-tbn0.gstatic.com/i...wjjUvmHpsHL132
C. bromus UnH dark brown with an ochreous overlay.
Feamle usually eith 1 -2 HW spots in space 2 & 3.
Taiwan note HW spot.
https://farm3.static.flickr.com/2813...c2551d54_b.jpg
https://live.staticflickr.com/554/18...586c0ecf_b.jpg
Unknown location female.
https://static.inaturalist.org/photo...jpg?1545656453
C. Malaya FW without cellspots (occasionally tiny ones).
http://yutaka.it-n.jp/hes/93360001.html
TL Seow: Cheers.