Eudonia alopecias is a moth in the Crambidae family. It was described by Meyrick in 1901. It is found in New Zealand. The wingspan is about 23 mm for males and 18 mm for females. The forewings are ferruginous-brown, in males sprinkled with white towards the termen. The hindwings of the males are very pale whitish-fuscous, slightly brassy-tinged and the termen suffused with fuscous. The hindwings of the females are fuscous, becoming darker posteriorly. Adults have been recorded on wing in February.