Last modified: March 24, 2021, 6:12 p.m.
A very rare and local species, almost exclusively confined to the Kempen.
Hibernates as a small larva in a cocoon formed on the food plant or in fallen debris.
The male basks on stones and broken or bare ground and is easily disturbed by day. Both sexes found at rest on their food plants after dark. They come to light in small numbers.
During very good weather conditions a second smaller partial generation can occur, mostly in september even in October.
The adults fly in one generation a year: from early May till late June.