Orocrambus machaeristes is a moth in the family Crambidae. It was first described by Edward Meyrick. It is endemic to New Zealand, where it has been recorded from north-western Nelson, south along the Southern Alps to Lake Wakatipu. This species prefers alpine habitat and inhabits areas populated with snowgrass and tussock species. The range of this moth coincides with the range of the tussock species Chionochloa pallens. Adults are day flying and have been observed on the wing from December until February.

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