Reasonably common in Britain and Ireland. Males cannot be reliably distinguished from Trichiosoma laterale at present. The female is black on the abdomen and lacks any reddish-brown laterally or beneath. On the apical tergites, the silky, adpressed pubescence does not obscure the underlying puncturation.
Larvae feed on birch.
Size: 13 - 24mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June
Plant associations: Betula spp. (birches)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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