It might just be P. juno male.
Sometimes on the underside FW spot 8 is partially present, but on the upperside fully missing, as seen in this shot.
http://3.bp.blogspot.com/-eLxO6Cqrl-...it%2BBrown.jpg

A female P. juno showing the fully absent FW spot 8 on the underside.
https://1.bp.blogspot.com/-WroJpPq0U...Dart-KohCH.jpg

TL Seow: Cheers.