A rather common species throughout Belgium.

The larva lives on animal and plant refuse, preferring woollen material. They construct tough cases with that material.

The adults fly in two hard to separate generations from May till October. Indoors, they can develop continuously in heated rooms. They come to light.

ID: The ground colour of the hindwing is dark fuscous which distinguishes the species from M. crocicapitella where the ground colour of the hindwing is whitish grey.