Orthomecyna mesochasma

Orthomecyna mesochasma is a moth of the Crambidae family. It is endemic to Kauai.

Larvae have been found among the roots of sugarcane. The caterpillars are whitish. It is the only record of the discovery of a larva in the Orthomecyna genus. It is thought the caterpillars are subterranean in habit or bore in the basal parts of grass plants and are thus hard to find.