Males are very rare. The species is largely black above and green below. The lower face of the male is white and in the female also often the mandible base, the labrum, sometimes the anterior margin of the clypeus, the posterior margin of the pronotum, the tegulae (always in the female, mostly in the male). The legs whitish usually on the coxae, base of the femora. Rarely the hind leg is completely black with the tip of the tibiae blackish or brownish and the tarsi often brown. Mostly the temples of the male are slightly translucent.
Larvae feed on grasses including meadow grass and fescues.
Size: 4.0 - 5.5mm.
Distribution: England, Scotland, Wales, Ireland
Flight period: Multivoltine, April to September
Plant associations: Gramineae including Poa spp. and Festuca spp. (grasses including meadow grass and fescues)
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