''Diasemia monostigma'', the black wedge pyrale, is a moth of the family Crambidae. It is found in South and East Africa, including islands of the Indian Ocean.afromoths.net
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References

Spilomelinae Moths of Madagascar Lepidoptera of Zimbabwe Moths of Réunion Moths of Sub-Saharan Africa Moths described in 1913 Lepidoptera of South Africa {{Nomophilini-stub