Pruche de l'Ouest
The larvae feed on the foliage of Pinaceae species, including "Abies grandis", "Picea", "Pinus", "Pseudotsuga menziesii" and "Tsuga heterophylla". Mature larvae reach a length of 20 mm. They have a cream coloured body, overlain with dark mottling and a brown head. The species overwinters as a mid instar larva. Pupation takes place in May or June.