Looking at my Curetis images and trying to sort them out. Three images of a Curetis species from Mae Ping, northern Thailand. All three images the same individual. According to the literature there are 4 possible Curetis species occurring in northern Thailand - Santana, acuta, bulbis and saronis.
From the size/shape of the upper forewing red patch, this should be either santana or acuta. I would have said, based on the deeper notch on the upper edge of the red patch that this should be acuta. Also the shape of the trailing edge of the hindwing (with a small bulge on the end) would be more like C. acuta. I would welcome comments.

Many thanks

Sunbeam 3 (1).JPG

Sunbeam 3 (2).JPG

Sunbeam 3 (3).JPG