This is one of those enigma in Singapore that have never been solved.
In the past there were examples with various trace of tornal white cilia.
eg.
https://www.butterflycircle.com/chec...20Tan%20CP.jpg
https://www.butterflycircle.com/chec...-2---Tan-C.jpg
https://blogger.googleusercontent.co...lt_Khew_01.jpg
https://blogger.googleusercontent.co...onathan_01.jpg
https://blogger.googleusercontent.co...en_wing_01.gif
They were also examples in which the tornal white spot is quite distinct eg.
https://blogger.googleusercontent.co..._female_01.jpg
https://blogger.googleusercontent.co..._female_01.jpg
Also present are examples without the white tornal spot.
https://www.flickr.com/photos/budak/52368565445
https://wanderingbutterflyeffect.wor...1c48c6860d.jpg
The only way to find out if there are two species is to catch a male with a defined white spot.
Squeezing the abdomen will cause the valvae (claspers) to open out.
A smartphone picture of the inside of one of the valva, zoomed for comparison.
https://yutaka.it-n.jp/lyc4f/81900001.html
https://yutaka.it-n.jp/lyc4f/81920010.html
TL Seow: Cheers.
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