Seq # 901600010

Cosmia trapezina (Linnaeus, 1758) Species

Last modified: Oct. 6, 2021, 12:56 p.m.

A common species throughout Belgium.


Family: Noctuidae > Subfamily: Xyleninae > Tribus: Xylenini > Genus: Cosmia > Subgenus: Calymnia > Species: Cosmia trapezina
Vernacular names
Hyena (NL), Dun-bar (EN), Le Trapèze (FR), Trapezeule (DE)
First mention in Belgium
De Sélys-Longchamps E. 1844. Énumération des insectes Lépidoptères de la Belgique. — Mémoires de la Société royale des Sciences de Liége 2: 1–35. On page 13.




Museum specimens

Specimens in nature


The harmless-looking caterpillars of this species never hesitates to attack and eat other caterpillars, even when they are larger.


Hibernates as an egg and pupates in a cocoon among plant debris. The adults come to light and sugar.

No pictures yet!

Flight periods

The adults fly from mid June till September in one generation a year.

Observed on

Host plant (species):
Acer campestre and Populus tremula
Host plant (genera):
Quercus, Betula, Ulmus, Crataegus, Salix and Corylus
Deciduous trees and Carnivorous

The larva lives on different species of deciduous trees like Quercus, Betula, Ulmus, Prunus spinosa, Crataegus, Corylus, Salix, Populus tremula and Acer campestre.

No pictures yet!