3a Likely Caltoris malaya male.
The pale area on the antenna is prominent in C. cormasa, bromus & cahira, but less so in C. malaya, & even less so in C. philippina.
However the feature may be variable dependant of the flash or shot angle.
Here the FW is raised high enough to show no upper cellspot.
C. malaya. No cellspot Underside rusty brown in male, more ochreous in female.
All Singapore examples.
Males
https://1.bp.blogspot.com/-m1O18RS0-...M_adult_01.jpg
https://inaturalist-open-data.s3.ama...0812/large.jpg
https://inaturalist-open-data.s3.ama...650/large.jpeg
https://inaturalist-open-data.s3.ama...341/large.jpeg
female.
https://2.bp.blogspot.com/-ZFArQYADX...M_adult_04.jpg
Caltoris bromus. More often with 2 large subapical spots rather than 3.
FW almost always with two cellspot.
Underside dark brown overlaid with ochreous scalings.
Female almost always with 1 - 2 underside HW spots.
All Singapore examples.
https://i13.photobucket.com/albums/a...psd5aebfd1.png
https://i35.photobucket.com/albums/d...012---7140.jpg
https://www.inaturalist.org/observations/38212403
https://inaturalist-open-data.s3.ama...5527/large.jpg
Females.
https://inaturalist-open-data.s3.ama...2716/large.jpg (too red)
https://inaturalist-open-data.s3.ama...3072/large.jpg (too red).
https://inaturalist-open-data.s3.ama...504/large.jpeg
https://inaturalist-open-data.s3.ama...513/large.jpeg
Actual colour Female C. bromus Taiwan.
https://c1.staticflickr.com/7/6021/6...f055cc62_z.jpg
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