Euthalia aconthea or E. merta

[DaveChiangMai]

I photographed this at Sri Lanna NP, n Thailand this week. I can't decide if it is E. aconthea or E. merta. Evidently a female, but I find no consistent diagnostic features to tell females apart in images I can find. I think this is merta based on the size and shape of the white spots on the underside of the forewing. Comments appreciated.
Many thanks

26065

26064

[Psyche]

Female E. aconthea.

E. merta has outwardly pointing arrowheads, double on the HW.
https://i.pinimg.com/originals/9e/c4/a3/9ec4a3d87bfcd2d3c028d90285e4770e.jpg

TL Seow: Cheers.

[DaveChiangMai]

Many thanks for the clarification.