The common tree-nymph or common tree nymph (Idea stolli) is a species of nymphalid butterfly in the Danainae subfamily. It is found in South East Asia.There are 12 Idea species, of which 5 occur in West Malaysia. The wings are white with black dots and veins. The wingspan is about 150 mm. The larvae feed on Aganosma cymosa and Aganosma corymbosa.