Dryas octopetala
The larvae feed on "Dryas octopetala". They create a tubular silken case which is covered with frass grains on the outside. In the youth case, the frass cover is even and complete, in the full-grown case, the frass lies in lengthwise stripes. The full-grown case is three-valved and about long. The mouth angle is about 45°. Full-grown larvae can be found in June.