Ceylon tree nymph  (Idea iasonia)

Sri Lankan Insects:
http://www.srilankaninsects.net/Butterflies/Danaidae/CeylonTreeNymph/CeylonTreeNymph.htm

Gehan' s Guide to the Birds, Butterflies and Dragonflies of Sri Lanka by Gehan de Silva Wijeyeratne (In prep – available 2005):
http://www.jetwingeco.com/