A large, black species with metallic reflections. In female, the mesopleura have pale hairs longer than the width of the basitarsus. Mesosternum mainly unpunctured. In the male, the lateral lobes of the mesonotum are highly polished with at most a few weak punctures. Males best determined by the penis valve.
Status: Rare but widely distributed
Distribution: England, Scotland, Wales, Ireland
Flight period: March to April
Plant associations: Gramineae or Cyperaceae (grasses or sedges)
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