A pyralid moth belonging to the Marasmia generic complex of leaf-rolling defoliators of rice in S.E. Asia is described and named M. patnalis sp. n. It is differentiated from M. bilinealis (Hmps.), M. ruralis (Wlk.), M. suspicalis (Wlk.) and Cnaphalocrocis medinalis (Gn.), with which it had previously been confused because of similarity of the adults and shared host-plant association.
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