A black sawfly with pairs of white patches on tergites 2 to 5 (or 6). The eyes are almost round. The hind legs are mainly reddish-yellow, though they can be black, and the tarsal claws have a large inner tooth parallel to the outer tooth. The stigma is black, though this may fade in older specimens. In the female the serrulae have a very prominent lobe.
The larvae feed on willows.
Size: 6 - 7mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June
Plant associations: Salix spp. (willows)
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, Marko & Heidemaa, Mikk & Soon, Villu. (2011). Empria longicornis species group: Taxonomic revision with notes on phylogeny and ecology (Hymenoptera, Tenthredinidae). Zootaxa. 2756. 1-39. 10.11646/zootaxa.2756.1.1.