While studying the types of the Crambinae in the National Museum of Natural History, Washington, DC, I came across an odd-looking specimen with a crambine facies but with a very faint wing pattern unlike any crambine I had ever seen. A note that it was probably a member of the Pyraustinae (Pyralidae) had been written by A.B. Klots on the label of the female genitalia slide (prepared by Carl Heinrich on 30 August 1930). Closer examination showed that the tympana1 organs were of the pyraustine type, with the praecinctorium bilobed. Upon my request, E.G. Munroe examined the specimen and discovered that it belonged to the genus Udea Guenée in the Pyraustinae. The specimen is the type of Platytes aenigmatica Heinrich (1931), a species described in the Crambinae (Pyralidae). It is here transferred to the genus Udea as Udea aenigmatica (Heinrich), new combination. Because this name was classified incorrectly, the species was not treated by Munroe (1966) or included in Munroe (1983).
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