Patyja umminia - Male
Only Platyja sp. recorded in Sri Lanka
Check the female. Observed at the same vicinity.
https://www.inaturalist.org/observations/206737391
Coloured plate for the both male (fig. 6) and female (fig. 6a).
https://www.biodiversitylibrary.org/page/9340443#page/661/mode/1up
The Lepidoptera of Ceylon (page 201)
https://www.biodiversitylibrary.org/page/9340443#page/223/mode/1up