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)
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, 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.