An unusual (to me) because of the dark tone of blue of the upperside that attracted my attention.
considering the location, Thong Pha Phum, in the Kanchanaburi province, West Thailand, I have excluded few species present only in the Peninsula area.
Could it be J. caeruleus, or just elpis?
https://farm1.staticflickr.com/923/2...243d789e_c.jpg
Jamides sp.
Detail:
https://preview.ibb.co/dP1aOd/jamides_detail.png