Sawfly larva are semi transparent amber hued larva with a dark tube of innards running through them. Adults are black with clear wings. Sawflies eat birch leaves creating brown splotches and empty skeletal patterns on the leaves of birch trees.
Sawflies deposit their eggs in the beginning of summer, larva hatch in July and August, by end of September they have dropped to the soil and being to burrow in the foliage and soil. Adults emerge from the ground between June and July in Alaska.