Last modified: April 23, 2019, 12:44 p.m.
A common species throughout Belgium.
The adults fly from the beginning of May till August. They are active from dusk onwards and later come to light.
The larva lives on the comb in the nests of wasps and bumblebees in a silken tube or gallery. It overwinters in its cocoon. Pupation takes place in a cocoon in the nest, usually spun gregariously; sometimes outside the nest.