In the female the head is yellow with black on the anterior of the postocellar area, but the head can also entirely black on top. In the male the top of the head is almost always black, except usually a spot on the top corner of the eye and the orbits. The thorax is black with yellow on the pronotum, the tegulae and the metapleura. On the abdomen the basal tergite is more or less black with the following tergite blackened more or less in the middle. Otherwise the abdomen is yellow. The legs are yellow, with the hind tibiae often with a small black spot and darkened tarsi.
Larvae feed on willows, poplars and alder.
Size: Female: 6.0 - 7.0mm, male: 6.0 - 7.0mm.
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June, July to September
Plant associations: Populus spp., Salix spp. and Alnus glutinosa (willows, poplars and alder)
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