Two similar species can be very confusing.
They are medium, tailless, with a tooth at vein 2.
They normally lacks a white cilial at the tornus but sometimes it is weakly resent.

Arhopala amphimuta .Commoner.
UnH 'V' spot well-shaped with equal arms.
UnH postdiscal spots 3, 4, 5,& 6 of equal size & aligned as a band above the V spot.
Male upperside with blue to the margin ,female less.

https://www.gbif.org/occurrence/2847202539
https://www.gbif.org/occurrence/2847202527
https://www.gbif.org/occurrence/2847202533
https://www.gbif.org/occurrence/2847202529


Arhopala major.
In Singapore much the commoner of the two.
Male upperside with broad black border, the female more so.
UnH postdiscal spot 3, 4, 5, & 6 of unequal size & often dislocated.
V spot mishapen with unequal arms.
Singapore.
https://www.butterflycircle.com/chec...-2---Tan-C.jpg
https://www.butterflycircle.com/chec...20Tan%20CP.jpg
https://blogger.googleusercontent.co...lt_Khew_01.jpg
https://blogger.googleusercontent.co...ederick_01.jpg



16. https://www.inaturalist.org/observations/264051167
Arhopala amphimuta.
UnH v spot well-shaped & postdiscal band above it well-formed.


17. https://www.inaturalist.org/observations/264051164
A. amphimuta.


18. https://www.inaturalist.org/observations/264051158
Markings unclear.
Rounded HW, no tooth Likely subgroup of small species eg A zyida, stubsii etc.


19. https://www.inaturalist.org/observations/264051157
Female Arhopala amphimuta.


20. https://www.inaturalist.org/observations/264051148
Not clear enough. Amphimuta group, subgroup amphimuta.
Probably A. amphimuta itself.