De Sélys-Longchamps E. 1844.
Énumération des insectes Lépidoptères de la Belgique. — Mémoires de la Société royale des Sciences de Liége
1–35. On page 23.
Light to dark grey body with two large black dots and some smaller black spots on each segment. Head black.
A loose cocoon consisting of a few spun silken threads. Pupa dark yellowish with head, wing sheats and last abdominal segment black.
The larvae live gregariously in a silken web. Before pupation the larvae leave the web and make a very slight, more or less spherical web close to the ground. Each larva spins a slight silken web inside the spherical web.
The adults are active at night and come to light.