In females, the abdomen is entirely black and red on the hind legs is restricted to the apex of the femur and base of the tibia. The outer setae of the sawsheath in dorsal view are angled backwards to form an acute angle. In both sexes, the side lobes of the mesonotum are shining though only weak punctures on their lateral face. Males best determined by shape of penis valves. 8-9mm.
Dolerus gonager larvae feed on grasses.
Distribution: England, Scotland, Wales
Flight period: May to June
Plant associations: Graminaceae (grasses)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168