common species throughout Belgium.
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.
adults fly from the beginning of May till August. They are active from
dusk onwards and later come to light.
Antwerpen, Kontich, 18 July 2003.
female (Photo © Gaston Sallaets)