Males are very rare. Very variable in colour and size but the pale colour is green in life fading to yellow. The head is light yellow with black antennae and a black frontal ocellar spot, which can occupy the whole occipital area. The thorax in the male is black. The posterior corners of the pronotum, tegulae and more or less the mesopleura are pale. The female thorax is pale with black stripes on the mesonotum, and black marks on the scutellum and the scutellar appendage. The abdomen is pale below and mostly completely black above in the male, and in the female with a more or less broad middle stripe. The legs are pale with the apices of the tibiae and the tarsi black.
Larvae feed on birches.
Size: Female: 6.0 - 8.0mm.
Distribution: England, Scotland, Wales, Ireland
Flight period: April to September
Plant associations: Betula spp. (birches)
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