Tathodelta purpurascens is a moth of the family Noctuidae first described by George Hampson in 1893. It is found in India, Sri Lanka, Borneo and Bali.
Its forewings have a uniform purplish tinge. Pale postmedial strongly curved subcostally. The caterpillar is greenish. Head is glossy and whitish green. Pupa lacks a bloom. Larval host plant is Allophylus.
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