Prenesta scyllalis is a moth in the family Crambidae. It was described by Francis Walker in 1859. It is found in Brazil, Colombia, Peru, Costa Rica, Honduras, Belize and Mexico.
The wingspan is about 25 mm.Tijdschrift voor Entomologie 18: 220, pl. 12, f. 15-16 Adults are luteous (yellowish), the wings with red interior and exterior lines and with blackish marginal points. The forewings are reddish along the costa and there is a large reddish reniform mark.List of the Specimens of Lepidopterous Insects in the Collection of the British Museum 18: 566
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