rare and local species in Belgium. Rarely recorded.
larva lives inside the seed-heads of Cirsium vulgare and
hollows out a large cavity therein. It hibernates in a tough brown
cocoon on the ground amongst debris.
adults fly in one generation a year; during July and August. They are
active from dusk onwards and later come to light.
are difficult and examination by genetalia is advised, but following
aids can help; size individual, place of black dots, intensity and size
of markings and the angle of the three dots on the first line. This
species is the easiest to identify; it's the most robust and most
strongly marked and the three dots are well-developed and
Hainaut, Rongy, 14 July 2007.
(Photo © Chris Snyers)