This species is mainly parthenogenic with males being rare. The hind femur is red in contrast to the black and white hind tibiae. The front femora and tibiae are at least dark in part. The female has a white scutellum and white flecks on the lateral faces of the abdomen, but the rare males are black on those parts.
Larvae feed on ash and wild privet (seemingly not the garden varieties).
Size: 7- 8mm
Distribution: England, Wales, Ireland
Flight period: May to June
Plant associations: Fraxinus excelsior (ash) and Ligustrum vulgare (wild privet)
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