One of the black species. Arge expansa is thought to be a cooler climate species and is more likely to be encountered in north and central Scotland and Ireland. Females can be separated from Arge fuscipes by a pale costa and subcosta (dark in fuscipes) and in males the hind tibia are white at the base (entirely black in fuscipes).
Distribution: Scotland, Ireland
Flight period: June to July
Plant associations: Betula spp. and Salix spp. (birches and 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