Projection length 10-14 mm.
The larvae carried the wood of several pines, including the coastal pine, the sugar pine, the western yellow pine, the bishop's pine and the Monterey pine.
The larvae are dirty white, grayish or pink. They excavate a shallow cavity that penetrates the inner bark to the surface of the cambium of the wood. The pupation takes place in a dark brown chrysalis that is manufactured in a silk lined chamber within the pitch mass. Most people need two years to develop from egg to adult.
The main effect of larval feeding is the production of large amounts of resin by infected plants. Feeding larvae sometimes causes one or more limbs to die or become weak enough to break, especially if the infested trees are young.