Arge ustulata is a largely brown species with a bronze/green sheen. The stigma is bicolorous being clear yellow at the apex (including the marginal veining) and dark brown at the base. The subcosta and radial vein are pale yellow.
Larvae feed on willows, birches and hawthorn.
Distribution: England, Scotland, Wales, Ireland
Flight period: Bivoltine, May to July
Plant associations: Salix spp., Betula spp. and Crataegus spp. (willows, birches and hawthorns)
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