Curetis bulis in Singapore.

[Psyche]

I came across one of Federick's shot taken in the Rail Corridor 2015, that is practically certain to be C. bulis.
http://2.bp.blogspot.com/-AY_mIJ9DjJA/VYQkXPE-qDI/AAAAAAAARlA/PkyVdGLrcUI/s1600/HFH_0749-Sunbeam-Uppersides.jpg

C&P4's key states for C. bulis.
Male upperside HW with at least half of space 7 black & basal & tornal areas heavily darkened.
Examples from Koh Phangan
http://farm9.staticflickr.com/8483/8209484849_2343c3ff82_z.jpg
https://www.flickr.com/photos/angiud/8052667376/
https://www.flickr.com/photos/angiud/8052679006/in/photostream/
https://wingscales.com/content/record/172-1-cde3f.jpg

For C. santana :Male HW space 7 mostly orange & basal & tornal areas not heavily darkened.
http://yutaka.it-n.jp/lyc3/84050010.html
Malaya.
http://3.bp.blogspot.com/-rD03xEDFVMU/VSKmHMpYk1I/AAAAAAAAUxs/rDAt4OKQ_OM/s1600/DSC_0103.JPG
Singapore.
http://3.bp.blogspot.com/-PCJviRj0BnI/T75Ta9pTnPI/AAAAAAAAHeM/xMAeCwe9c-k/s1600/MalayanSunbeam-KohCH.jpg
http://www.butterflycircle.com/checklist/mugshots/Curetis%20santana%20malayica/131-2-Curetis-santana-malayica-(Malayan-Sunbeam)--Sunny.jpg
http://4.bp.blogspot.com/-vMQmYCCvVK0/T75RnhVVjsI/AAAAAAAAHd0/X6FBFFjDUmc/s1600/MalayanSunbeam-LokePF.jpg
http://2.bp.blogspot.com/-Xbka1bL2hYU/TeEj9KaeCuI/AAAAAAAAK9Q/uB7_NEysJ5U/s1600/MS_adult_03.jpg

Note on the underside ; the submarginal spots 6 & 7 are in line in C. bulis & out of line in C. santana.
This one below is practically certain to be C. bulis.
http://2.bp.blogspot.com/-lM4vacS-ezA/T75SDAA5dHI/AAAAAAAAHeA/HR2SZ3HkHTo/s1600/MalayanSunbeam-NelsonO.jpg
Correction : This a male C. sperthis :The FW band is bent & parallel to the termen.

TL Seow: Cheers.