Orthomecyna exigua is a moth of the family Crambidae. It is endemic to the Hawaiian islands of Molokai, Maui, Lanai and Hawaii.
Subspecies Orthomecyna exigua exigua (Molokai, Maui, Lanai, Hawaii) Orthomecyna exigua cupreipennis Butler, 1883 (Lanai)
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