Can be quite tough to ID gender in field shots because of perspective distortion.
Male :FW outer (distal) margin straight ; palpi a bit shorter , the upper black portion & the lower white portion of about the same length.
http://www.butterflycircle.com/check...1%20270508.jpg
https://besgroup.org/wp-content/uploads/Dark-Posy.jpg
https://1.bp.blogspot.com/_yzw2AzY2d...ark+Posy+2.jpg
Female: FW outer margin partly rounded; Palpi longer, the black portion longer than the lower white portion.
https://wanderingbutterflyeffect.fil...eea567860c.jpg
https://i.pinimg.com/originals/0b/59...83d30f39fa.jpg
http://www.butterflycircle.com/check...P_adult_04.jpg
TL Seow: Cheers.