10. Choaspes furcatus.



C. stgmatusTail lobe much longer than the main black mark; black marks well-spaced out.
http://yutaka.it-n.jp/hes/90300010.html
https://www.flickr.com/photos/angiud/36080964220
https://thaibutterflies.com/wp-conte...-stigmatus.jpg
'
The other three have shorter 'tail'.

C. benjaminii ;HW space 1b black mark usually narrower than the adjacent orange space; green head hairs cover most of top part around the eye.
http://yutaka.it-n.jp/hes/90310010.html
https://commons.wikimedia.org/wiki/F...rasekharan.jpg
https://commons.wikimedia.org/wiki/F...on_Awlking.jpg

C. furcatus ;HW black mark in space 1b strongly incurved; Upper rim of eye have more orange hair.Male up. brownish.
http://yutaka.it-n.jp/hes/90340001.html
https://www.ifoundbutterflies.org/sp...oaspes-furcata
https://thaibutterflies.com/Butterflies/page/64/
https://www.flickr.com/photos/buxa_t...e/10169827105/


C. xanthopogon ;HW black in space 1b typically much wider than the adjacent orange space; male up. brown
http://yutaka.it-n.jp/hes/90320001.html
https://thaibutterflies.com/project_...iidae/page/64/
https://www.flickr.com/photos/irrubescens/16067619111


TL Seow:Cheers.