Küsten-Tanne
The larvae feed on the foliage of various coniferous trees, including "Tsuga heterophylla", "Tsuga mertensiana", "Pseudotsuga", "Thuja plicata", "Abies amabilis", "Abies grandis", "Abies lasiocarpa" and "Picea engelmannii". They have a rusty brown to gray body with white dorsal patches and a light tan head with reddish-brown mottling. They reach a length of up to 20 mm. When at rest, the larva resembles a bird dropping. Larvae can be found from May to July. The species overwinters as an egg. Pupation takes place in a cocoon on a twig in August.