An entirely black species. In females, the sawsheath is very broad at the tip (as wide as the apical width of the hind tibia) with long curved setae. In both sexes there is a shiny unpunctured area adjacent to the sulci posterior to the ocelli. Males can be determined by the penis valve.
Larvae on grasses.
Distribution: England, Scotland, Wales, Ireland
Flight period: April to June
Plant associations: Gramineae (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