Host plants:
The caterpillar lives on Pinaceae (conifers). The main host plant is the spruce (Picea abies). There are also records from Larix, Pinus and Abies.
Habitat:
Hylaea fasciara colonized (mixed) coniferous forests of all kinds.
Life cycle:
The caterpillar overwinters. I found them in May 2010 on the eastern Swabian Alb on spruce. The moths fly in a single generation or two (depending on the region) from May to September or even October.
Remarks:
Hylaea fasciara occurs in a green and a red-brown variant.
The distribution ranges from the British Isles to China. In the north even Northern Scandinavia is reached. Hylaea fasciara is largely absent from Southern Europe (southern Mediterranean).