Rhagoba octomaculalis is a moth in the family Crambidae. It was described by Frederic Moore in 1867. It is found in India (Sikkim, Darjeeling, Arunachal Pradesh).
Adults are dark fuliginous black, with the base of the forewings metallic blue.Proceedings of the Zoological Society of London It is a somewhat variable species. In some specimens, each wing is marked with two transparent white spots, while in others only with one, and in still others the spot of the hindwings is also missing.XVIII. A catalogue of the Pyralidina of Sikkim collected by Henry J. Elwes and the late Otto Möller
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