The female is predominantly black above with a dark stigma and more or less pale on the apical margins of the tergites, the labrum, the apex of the clypeus, the outer orbits, the pronotal margin, the edge of the tegulae and the bases of the tibiae. Males are best determined by the shape of the hypopygium and penis valves.
Larvae feed on birches.
Size: Female: 7 - 9mm, male: 6 - 7mm.
Distribution: England, Scotland, Ireland
Flight period: April to May
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
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63-127