Mecyna prunipennis is a moth in the family Crambidae. It was described by Arthur Gardiner Butler in 1879. It is found in Japan.
The wingspan is about 13 mm.Japanese Moths The forewings are reddish brown, tinged with plum colour and with a greyish spot at the end of the cell. The hindwings are dirty ochreous, with a grey external border.The Annals and Magazine of Natural History, 1879. 1879
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