The female is yellow with a black frontal ocellar spot and black on the occipital field, mesonotum, sometimes the scutellum in the middle, the prosternum, and most of the mesosternum. In the male the head is black with yellow on the labrum, clypeus, behind the orbits, and the interantennal crest. The antennae are often brown on the underside. The thorax and abdomen are yellow with black on the sternum, mesonotum, metanotum, mostly that scutellum and more or less the dorsum of the abdomen. The legs are yellow with black on the hind tibiae apices and the tarsi.
Larvae feed on willows and sometimes birches, hazels, poplars and elms.
Size: Female: 6.5 - 8.0mm, male: 5.0 - 6.0mm.
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June, July to September
Plant associations: Salix spp., and sometimes Betula spp., Corylus spp., Populus spp. and Ulmus spp. (willows and sometimes birches, hazels, poplars and elms).
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
Muche, W.H., 1974. Die Nematinengattungen Pristiphora Latreille, Pachynematus Konow und Nematus Panzer (Hym., Temthredinidae). Deutsche Entomologische Zeitschrift, 21(1/3), pp.1-137.
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