The fore wing is yellowish or brown with a smudge beneath the stigma that does not extend right across the wing (not extending beyond the radial cell). The hind femur is black.
Larvae are unknown. Species is most often encountered in the south.
Flight period: June to July
Plant associations: unknown, possible a stem borer
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