Idea lynceus

 ( Idea ) 

Idea lynceus, the tree-nymph ( Malaysian giant tree-nymph), is a species of Nymphalidae butterfly in the Danainae subfamily. It is found in South East Asia.

The wingspan is about 135–165 mm.

The larvae feed on Aganosma corymbosa.

• I. l. favorinus Fruhstorfer, 1910
• I. l. fumata Fruhstorfer, 1897 (southern Borneo)
• I. l. lynceus (Malaysian giant tree-nymph)(Burma, Thailand, Peninsular Malaya, Langkawi, Sumatra)
• I. l. niasica Fruhstorfer, 1903 (Nias)
• I. l. reinwardti Moore, 1883
• I. l. thalassica Fruhstorfer, 1910