A6 Arhopala eumolphus maxwelli female
Keys 1, 7, 8, 95, 153, 154, 155, ( key 191 leads to A corinda & the aurea group which can be visually eliminated), 179, 181, 187, 189.
It is usually impossible to differentiate between A. eumolphus & A horsfieldi based on the underside. Thankfully this one possess 2 characters seen only in A eumolphus; i.e. forewing postdiscal spot 4 and spot 5 overlaps by less than half, and hindwing spot 6 overlaps both the cellend bar & spot 5.

TL Seow