4a Potanthus omaha female.
4b male.

Abdominal end yellow ;Underside lightly dark shaded. Veins variably dark dusted both upper & under sides.

Similar with abdominal end yellow.
Deeper orange colour with heavier shading.
Veins not or barely dark dusted (difference more distinct on UpH.
Male. P.Malaysia.
https://2.bp.blogspot.com/-r1T4ajMPu...25286%2529.jpg
Male & female, Singapore.
https://4.bp.blogspot.com/-L3ew9ztkI...thus-ganda.jpg
https://3.bp.blogspot.com/-e_HuBihng..._underside.jpg


5. Potanthus trachala.
Although not perfect, the view is sufficient to ID. P. trachala in Singapore.