Arhopala madytus, the bright oakblue, is a butterfly of the family Lycaenidae. The species was first described by Hans Fruhstorfer in 1914.Fruhstorfer, H. (1914). "Neue Arhopala Rassen". Deutsche entomologische Zeitschrift (Iris). 27 (4): 155–166. 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.
The wingspan is about 40 mm. Similar to Arhopala meander but above lighter bluish-violet. Beneath particularly the forewing shows dark longitudinal stripes on the hoary whitish-grey ground. Seitz, A. Band 9: Abt. 2, Die exotischen Großschmetterlinge, Die indo-australischen Tagfalter, 1927, 1197 Seiten 177 Tafeln
The larvae feed on Terminalia catappa, T. melanocarpa, T. sericocarpa and Hibiscus tiliaceus. They are attended by the ant species Oecophylla smaragdina.
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