Metacrias erichrysa is a species of moth of the family Erebidae. It is found in New Zealand, where it is known from the western alpine areas of the South Island and mountains of the lower half of the North Island. Adults males are brightly coloured and diurnal, while females are buff coloured and extremely short-winged. They remain within their cocoon for mating and egg-laying. The larvae feed on Senecio bellidioides.