The three species C. santana, sperthis & bulis belongs to a group characterised by a speckling of black dots .
They can be quite confusing to separate from the underside alone in fieldshots due to perspective distortion.
SPERTH.png
Curetis sperthis sperthis.
The diagnostic feature in the male is that the UpH space 7 is black.
UpF postdiscal band band is more parallel to the margin in the lower half.
HW postdiscal spot 6 & 7 are lunulate & in line, submarginal spots 6 & 7 likewise.
These images are set specimens as the only way to ensure the IDs are correct.
http://yutaka.it-n.jp/lyc3/84070001.html
https://en.wikipedia.org/wiki/Cureti...isMUpUnAC1.jpg
Note the observation matches the markings.
In addition the broken part of the HW shows space5 marginal area largely black which is often in sperthis & bulis.
(IN C. santana the black margin in space 5 is typically narrow.)
Curetis santana
HW space 7 mostly orange.
UpF band oblique.
UnH postdiscal spot 6 & 7 inline ,margins mostly straight.
UnH submarginal spots 6 & 7 dislocated & out of line.
http://yutaka.it-n.jp/lyc3/84050010.html
https://ms.wikipedia.org/wiki/Cureti...caMUpUnAC1.jpg
https://www.butterflycircle.com/chec...20-%20Mark.jpg
http://www.butterflycircle.com/check...Sunny-Chir.jpg
https://3.bp.blogspot.com/-iR9so13Eh...beam-NonaO.jpg
http://www.butterflycircle.com/check...am)--Sunny.jpg
Curetis bulis.
HW space 7 at least half black.
UnF band oblique.
UnH postdiscal spot 6 tuck under spot 7.
UnH submarginal spot 6 & 7 usually joined end to end.
http://yutaka.it-n.jp/lyc3/84030010.html
P. Malaysia.
http://3.bp.blogspot.com/-r4mQgTdE6x...0/DSC_0074.JPG
http://4.bp.blogspot.com/-tIUJ97is3R...C_0064-001.JPG
TL Seow; Cheers.