Synemon gratiosa, the graceful sun-moth, is a moth in the Castniidae family. It is found in Western Australia, from Namburg National Park in the north to Mandurah in the south.
The wingspan is 25âÂÂ35 mm.
Adults are on wing in autumn. There is one generation per year.
The larvae feed on Lomandra maritima and Lomandra hermaphrodita.