One of the black and orange species. The thorax, head and wings are black. The legs are dark at the bases and tarsi. The abdomen, femora and tibia are orange. Only females are known in Britain and Ireland.
Larvae feed inside the stems of soft rush.
Size: 5 - 7 mm.
Distribution: England, Scotland, Wales, Ireland
Flight period: May to July
Plant associations: Juncus effusus (soft rush)
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