Parthenogenic with males extremely rare. The pale colour is yellowish in life. There is a more or less large black postoccipital spot, that often extends to the occipital field, three black longitudinal marks on the mesonotum, which often coalesce. The dorsum of the abdomen has wide bands on the tergites though the apical tergite is usally pale. The femora are often slightly blackened and the hind tibia and tarsi are blackish. The antennae are sometimes light brown on the underside.
Larvae feed on false acacia.
Size: Female: 6.0 - 7.0mm.
Flight period: May to June
Plant associations: Robinia pseudoacacia (false acacia)
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
Muche, W.H., 1974. Die Nematinengattungen Pristiphora Latreille, Pachynematus Konow und Nematus Panzer (Hym., Temthredinidae). Deutsche Entomologische Zeitschrift, 21(1/3), pp.1-137.
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63-127