Drepana arcuata – Arched Hooktip

Caterpillar food: alder (Bugguide) and birch (Covell)

Larvae live in silk lined shelters on leaves that have the edge folded up. When disturbed they are said to make a faint tapping noise. Pupation within the folded leaf in a tough, pale brown cocoon. (Moths of Western North America)

Adults from the later generation – July and August – seem to be darker. The ground color of their wings is dark yellow or brown, rather than the white or light tan of the earlier generation.

6/4/2008 – during the day on a grass stem