Location - Thalangama tank
Expanse - Male 5 cm Female - 5.4 cm
Reference - The Lepidoptera of Ceylon - F. Moore, F.Z.S. Vol 2. page 69 as Argina argus
External Links - https://en.wikipedia.org/wiki/Mangina_argus
Larval host Plants - Young leaves of Crotalaria species. Larvae observed at above location were feeding on Crotalaria retusa leaves.