very local species in Belgium, nowadays confined to the limestone
area in the province of Namur.
young larva makes a circular blotch mine in the leaves of Fagus
sylvatica, sometimes on Quercus or Tilia. Then
it falls to the ground in a case cut from the blotch. This case
is subsequently replaced by bigger ones as the larva grows. The
caterpillar then eats dead leaves. It hibernates fully-fed in that
case. Pupation in the case amongst leaf-litter.
adults fly from April till the end of May. The moths are active
during the day.
Namur, Belvaux, 23 April 2005.
(Photo © Chris Steeman)