Last modified: Feb. 20, 2021, 4:27 p.m.
A rare species in Belgium, more observed in the northern part.
Hibernates as a fully grown larva in a gall-like cocoon on a leaf or twig. Flies mainly at night, usually on warm nights and coming to light in small numbers. Sometimes also active during sunny afternoons.
The adults fly in one generation a year: from late May till late July.
The larva lives mainly on Fagus and Quercus in ancient woodlands.