Isonomeutis amauropa is a species of moth in the Copromorphidae family. It is endemic to New Zealand where it can be found on both the North and South Islands. I. amauropa inhabits native forest particularly forest dominated by Rimu and native beech trees. The larvae of this species consumes margarodid scale insects that live under the bark of these trees. When mature the larvae pupate in a cocoon made of silk and covered in twigs and frass. This cocoon is normally placed under the bark of the same tree the larvae inhabited. Adults of I. amauropa are on the wing from September to February.

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