Last modified: Oct. 26, 2023, 3:22 p.m.
A rather common species in most areas of Belgium, especially in the Kempen region and the eastern part of the country.
The head and neck-shield are yellowish, the neck-shield much less spotted, on the head only 1-2 blackish spots in front on each half.
The larvae live gregariously in a conspicuous spun web over the leaves of the food plant. Pupation in the feeding place.
The adults are active at dusk and later come to light and sugar.
The first adults fly from May but usually from June towards late August, occasionally there is a small second emergence from early September till early October, occasionally later.
The larvae live on several Quercus species, preferably on saplings.