These two species can be very confusing sometimes.

The markings are so variable that they seem to overlaps sometime.

Typically male gremius have 3 subapical spots & female two; cellspots variable in both sexes.
HW underside typically three prominent spots in space 1b, 2, & 3.
http://butterflycircle.blogspot.my/2...-palm-bob.html

S. minutus have 2 subapical spots or less.cellspots variable.
HW underside may be white shaded; 2 prominent spots in space 1b & 2, spot 3 being absent or vestigial.
http://wingscales.com/content/record/569-1-44077.jpg
https://lh3.googleusercontent.com/-f...2/3S7_7981.jpg
http://wingscales.com/content/record/570-1-8f2ec.jpg
http://www.samuibutterflies.com/02_i...utusaditia.jpg


So there is a strong suggestion this S. minutus aditia.
However, the spots have a pale ring & this is only seen in S. gremius.

It appears this is a localised colony of S. gremius with small & reduced spots.

TL Seow : Cheers.