Confirmed as present in Britain in 2002, A. berberidis probably arrived on these shores around 2000. The adult is hard to distinguish from the other three black Arge species from images. Females have a characteristic pincer-shaped sawsheath when viewed from above. Males are identified by transverse striations on the tergites.
Overwinters in the ground as a pupa.
Distribution: England, Wales, Ireland
Flight period: Bi- or trivoltine, May to October
Plant associations: Berberis spp. (esp. thunbergii) and Mahonia spp.
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