A recognisable elongate Nematus with a torpedo-shaped body. In both sexes the abdomen is dark with a red girdle. The mesonotum and mesopleura are dulled by heavy punctures and surface sculpture.
Larvae feed socially on hawthorn and blackthorn.
Size: Female: 8 - 11mm
Distribution: England, Scotland, Wales, Ireland
Flight period: April to June
Plant associations: Crataegus spp. and Prunus spinosus (hawthorns and blackthorn)
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