Comprehensive DescriptionRead full entry
General DescriptionAdults: Black sawflies approx. 5.0 mm long. Front and middle tibia brownish. Antenna segment 3 shorter in length than segment 4 + 5. All sawflies of this group posses an ovipositor modified to be used as a saw to facilitate the deposition of eggs under the surface of leaves. Lancet (saw portion of ovipositor) with 17 serrulae (teeth), each long and pointed at apex. Larvae: Small, black and slug-like in appearance, approx. 1.0 mm long at hatch, 11.0 mm long at pupation. Feed on the upper and lower surfaces of leaves. 6 or 7 instars. Dark brown or black head capsule in later instars. Covered with black slime. Pupae: Forms underground within a cocoon constructed of silk and soil. Adapted from descriptions in Smith 1971 and Goulet 1992.