Hirayamaia is a monotypic snout moth genus described by Nobukatsu Marumo in 1917. Its only species, Hirayamaia regalis, was described by John Henry Leech in 1889. It is found in Korea, Japan and China.A review of the tribe Pyralini Latreille (Lepidoptera, Pyralidae, Pyralinae) from Korea
The wingspan is 28–30 mm.Japanese Moths Adults are on wing from June to September.
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