A stocky orange and black species with dark wings (except for yellow on the apical half of the stigma). Females have the head, thorax and first two tergites black and the remainder of the abdomen orange. In males the orange is more extensive but at least the clypeus, tegula and pronotum are black.
Nematinus fuscipennis larvae feed on alders.
Size: 6 - 7.5mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to July
Plant associations: Alnus spp. (alders)
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