Arhopala aroa ,a distrinct possibility in Singapore.

A recent observation strongly suggest it is Arhopala aroa.

Fleming recoded Arhopala aroa in Singapore in his book.
The late Sunny Chir actually shoed a montage of 4 similar Arhopala, one of which was suspiciously like A. aroa, with a very narrow tapered HW spot 6.
This seem to be lost.
Attachment 28953

Arhopala aroa
Wings more elongate so that the markings are more separated.
FW termen rounded also in the male.
Postdiscal and submarginal spots are well separated, on FW by about 1.5 width of pd band and on HW by about width of pd band.
HW spot 6 tends to be narrow & more tapered.
Male upperside dark violet blue.
https://yutaka.it-n.jp/lyc4f/82180001.html
https://www.gbif.org/occurrence/2847202428
https://www.gbif.org/occurrence/2847198381
Female.
https://www.gbif.org/occurrence/2847198379


In contrast Arhpala sublustris which is the commonest member of the alea subgroup in Singapore.
Wings not elongate.
FW margin straight in lower 2/3.
Postdiscal and submarginal close and may touch on the HW.
HW spot 6 wider & less tapered.
Male upperside bright shiny blue.
https://yutaka.it-n.jp/lyc4f/82170010.html
https://www.gbif.org/occurrence/2847203350
https://www.gbif.org/occurrence/2847203388
Female.
https://www.gbif.org/occurrence/2847203298

The observation.
https://www.inaturalist.org/observations/330091180

Images of A. sublustris males with upperside confirmation for comparison.
https://www.inaturalist.org/observations/245210966
https://www.inaturalist.org/observations/86168391
https://www.inaturalist.org/observations/86284346


TL Seow: Cheers.