Arhopala madytus, the bright oakblue, is a butterfly of the family Lycaenidae. The species was first described by Hans Fruhstorfer in 1914.[1] [2] It is found on New Guinea and adjacent islands (Aru, Ambon, Waigeu, from Western New Guinea to Papua, Woodlark and the Louisiades) and the north-east coast of Queensland, Australia.[3]
The wingspan is about 40 mm.[3] Similar to Arhopala meander but above lighter bluish-violet. Beneath particularly the forewing shows dark longitudinal stripes on the hoary whitish-grey ground.[4]
The larvae feed on Terminalia catappa, T. melanocarpa, T. sericocarpa and Hibiscus tiliaceus. They are attended by the ant species Oecophylla smaragdina.[3]