Host plants:
The larva feeds on grasses such as Bromus erectus.
Habitat:
Aulocera circe inhabits grassland complexes with trees, lean and also higher growing areas. The caterpillars live more in areas with vigorous, moderately dense growth (e.g Bromus erectus stands).
Life cycle:
Hibernation takes place as a young caterpillar (L2, L1 according to literature). I found half to fully-grown caterpillars in May in the Susa valley at 1000m altitude in denser vegetation on Bromus erectus. The adults are on the wing between June and September with peak in July and early August.
Endangerment: strongly endangered
Endangerment factors:
This species needs large habitats or a dense network of habitat islands with the suitable mosaic of the different areas. North of the Alps of the moth is very rare and local. South of the Alps, Aulocera circe is usually more common.
Since about 2003 Aulocera circe is spreading in some regions of central Europe due to global warming.
Remarks:
The distribution extends across southern and central Europe and temperate Asia to the Himalaya.