Erannis defoliaria (Grote wintervlinder (BE) / Mottled Umber (EN) / Große Frostspanner (DE) / Hibernie défoliante (FR)) is a moth of the family Geometridae.
There are not many moth species with an active life during the last days of october so identification of the species is not that difficult. The specimen in the image is clearly a male: the female of this species is wingless and rather spider-like and can be found on the trunks and stems of its larval food plants. The male is fully winged (wingspan 40–45 mm) and very variable. The ground colour of the forewings varies from pale cream to brown with brown to black basal area and a broad band in the same colour. The hindwings are whitish. This difference in form between individuals of different sex in the same species is called "sexual dimorphism".
Image: Schilde (BE) - 29/10/2010
© Johan Dierckx
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