It is Curetis sperthis.

The tiny black dots indicate the bulis group.
All the others, bulis, santana & felderi have the forewing band more slanted. See santana below.
http://fc08.deviantart.net/fs41/f/20...y_log1t3ch.jpg

This one have the forewing band more parallel to the termen.

PS. Another example of C. sperthis which looks different.
http://www.samuibutterflies.com/02_i...issperthis.jpg

PS2. The slant of the band in bulis/santana is strong. It is possible in some examples of felderi the slant may not be so strong, & so may cause a bit of confusion.

This one has the palpi spotted whereas the palpi of felderi is white & unspotted.
Below are examples of felderi. Note the 2nd has the band less strongly slanted.
http://yutaka.it-n.jp/lyc3/84080001.html