Pruche de l'Ouest
The larvae feed on the leaves of various conifers, including "Picea mariana", "Picea engelmannii", "Picea rubens", "Picea glauca", "Pinus contorta", "Pinus ponderosa", "Tsuga heterophylla", "Pseudotsuga menziesii" and "Abies lasiocarpa". They have a reddish body and a greenish-brown head. Larvae are found in June and July. The species overwinters as an egg.