As I said, quite a few Arhopala species share similar underside markings with A. athada athada including the "straight" postdiscal band on the FW underside. You cannot conclude that it is A. athada athada right away by comparing underside markings alone with the pic in the checklist. Get a copy of C&P4 and read up on the various distinguishing keys for Arhopala species, and you will learn it is not wise to jump to conclusion on many of the Arhopala IDs based only on field shots and underside markings.
Horace