Eyes divided in two parts. White, elongate, elyptical in cross-section. Small thoracic legs present. Body not strongly tapered.
Larva is a shallow sapwood borer and bark miner.
The larva do enter the wood to pupate. The holes left in the wood are elliptical in cross-section and adult exist holes are circular. Western larch , Douglas-fir and western hemlock are the preferred hosts. Species of Abies , Pinus and Picea are recorded hosts.