Erechthias hemiclistra is a species of moth of the family Tineidae. It was first described by Edward Meyrick in 1911. This species is endemic to New Zealand and has been observed in both the North and South Islands. It inhabits native forest and has an affinity for species in the genera Phormium, Cortaderia and Cordyline, likely as a result of its larvae feeding on dead fibre sourced from plant species in these genera. Adults are on the wing from September to April but are most commonly observed in December and January. Adults are also attracted to light.

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