Classification Order: Hymenoptera Family: Symphyta
Length About 10 mm
Phenology May to August
The adult sawfly has a black head and abdomen and dark orange thorax
Life Cycle The larvae are up to 2 cm long and covered in a white powdery substance. They camouflage themselves as bird droppings. The white powdery substance is easily rubbed off and in the final instar, when feeding is finished, the white powder is lost and the larva adopts a pale green appearance. There are two generations each year.
Habitat Around Alder trees
By Sandy Rae (Own work) [CC BY-SA 3.0], via Wikimedia Commons