The cleander group of Arhopala.

[Psyche]

The alea subgroup comprise five species in Singapore.
They are .A. sublustris, milleri, normani, phanda & aroa.

The subgrop is very difficult to ID.
Most features are variable & may be subjective.
The observations below is based on valid examples in C&P4, Fleming, Otsuka & Yutaka.

Two species are probably extinct in Singapore.

A. phanda is idetifiable by the HW spots 6 & 7 forming a column.
https://singapore.biodiversity.onlin...doptera-000442

Arhopala aroa.
This has the bands narrow so the markings are well-spaced.
The HW spot 6 tapers markedly from top to bottom becoming more triangular.
https://thaibutterflies.com/wp-conte...ala-aroa-1.jpg
Sunny actually shot one in which the HW spot 6 was almost triangular.
This picture seem to be lost.