Photographed at Mae Ping, n. Thailand.
Clearly this is a Nacaduba sp, but I am having a hard time deciding which.
The general appearance of the markings appears to favour sanaya, but the small amount of blue scaling in the tornal spot points against this.
Opinions please.

[Update - I think I just realized that this is actually Jamides bachus. Not the first time this species has fooled me!]