''Udea delineatalis'' is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

in the family

Crambidae The Crambidae are the grass moth family of lepidopterans. They are variable in appearance, the nominal subfamily Crambinae (grass moths) taking up closely folded postures on grass stems where they are inconspicuous, while other subfamilies includ ...

. It was described by Francis Walker in 1875. It is found on Saint Helena. The habitat consists of open grassy slopes.Wollaston, T.V., Mrs. Edith. 1879
"Notes on the Lepidoptera of St. Helena, with Descriptions of new Species"
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References

Moths described in 1875 delineatalis {{Udea-stub