Which Potanthus?

Both are female Potanthus trachala.

Both have the HW band's upperspot projected out from the spot 3 below it by more than half its lower margin.
In addition in pic 2, FW spot 4 ( lower of the two spots) have no overlap with spot 3 (hidden by the HW).

Both P. trachala & mingo look similar with a black band on the abdominal end & often heavy black marks.

Potanthus trachala. Large FW 14-15mm.
FW spots 4 & 5 have no overlap (ie fully detached) from the spots above & below them.
HW upper spot of band usually projected by half or more of its lower margin from the outer margin of spot 3 below it.
HW cilia chequered.
Males.
https://i.pinimg.com/736x/8c/bd/70/8...b0db7b591d.jpg
http://4.bp.blogspot.com/-kvlAhJLLsd...la-tytleri.jpg
Females.
https://3.bp.blogspot.com/-ZF4AycHaj...u/DSC_0070.JPG
http://www.butterflycircle.com/check..._female_02.jpg
http://2.bp.blogspot.com/-d1uwxt7ATt...s_trachala.jpg

Potanthus mingo. Small FW 12mm.
FW spot 4 & 5 with variable overlaps with adjacent spots. At the least spot 4 always overlaps with spot 3.
HW with upper spot of band not so strongly projected out, typically overlapping spot 3 by more than half.
HW cilia largely not chequered.

Male ;Note this male have FW spots 4 & 5 fully overlapping with the spots above & below them.
http://3.bp.blogspot.com/-f3wB2A2ujB...0/_MG_1531.jpg

Male with only spot 4 overlapping spot 3.
Spot 5 & 6 have no overlap, connected only by the spikes.
https://inaturalist-open-data.s3.ama...3/original.jpg

Pairs. Males on the right shows overlap of spot 4 with spot 3 below it.
https://inaturalist-open-data.s3.ama.../original.jpeg
https://2.bp.blogspot.com/-tFtROXZYi...us%2Bmingo.JPG

TL Seow: Cheers.