Hyposmocoma metrosiderella

Hyposmocoma metrosiderella is a species of moth of the Cosmopterigidae family. It is endemic to Kauai. The type localities are Halemanu and Kaholuamano, where it was collected on an altitude of 4,000 feet.

The larvae feed on Metrosideros species. The larva makes a rough case of frass with a loose lip. The case is somewhat flattened, pouch-shaped, with a short obtuse curved attenuation posteriorly, the middle is widened and the whole case is of a dull dark brownish and fuscous colour.