Abies grandis
The larvae feed on the foliage of "Abies amabilis", "Abies grandis", "Pseudotsuga menziesii" var. "glauca" and "Tsuga heterophylla". Mature larvae reach a length of about 35 mm. They have a creamy-yellow body, marked with orange middorsal patches and with a light tan head with dark spots. The species overwinters as a mid-instar larva. Larvae feed from April to June. Pupation takes place in June.