Binomial Name: Idea iasonia
English: Sri Lanka Tree Nymph/Ceylon Tree Nymph
An endemic butterfly found in wet zone and dry zone forests of Sri Lanka. It has a unique slow floating flight with very slow wing beats. In the wet zone this butterfly can be seen flying in the canopy layer of the forest. In IUCN Red list it is categorized as 'Near Threatened'. Deforestation has become the major thread for this butterfly.