Ovoid, pale green, with a brown tint developing after a few days. Resembles that of Marumba , but tapers anteriorly when fully grown, with a distinct, yellow, tuberculate structure on anal flap. Horn erect, slightly curved and granulose. Cremaster curved dorsally, with a pair of spines on an extended tip and a few lateral ones. Mainly trees of the Tiliaceae, Fagaceae, Betulaceae, Ulmaceae and Rosaceae.
Gynandromorphs are also quite common.
The male abdomen, on the other hand, is strongly curved and slender. Up to 1500m in the Alps. After emergence during the morning, many adults are to be found resting on the trunks of host-trees, where they have expanded their wings. Subsequently, most prefer to hang suspended amongst foliage. The female takes flight shortly after dusk and almost immediately commences egg-laying.