In males, all the entire abdomen is black including all sternites, the antennae are reddish-yellow. Male faces lack definition with any sutures, and the eye margins, ill-defined. The face is domed outwards between the antennae. The eighth tergite has a long medial projection.
Larvae feed on hawthorns.
Distribution: England, Scotland, Wales, Ireland
Flight period: April to July
Plant associations: Crataegus spp. (hawthorns)
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