Both males and females occur in Britain and Ireland. The basal tergites of the abdomen have regular transverse coriaceous sculpture. In both sexes, the frons bulge is deeply and broadly indented. The male's head, thorax and abdomen are mostly black dorsally. The female usually has a black mark on the middle lobe and lateral lobes of the mesonotum and an all black mesosternum. The sawsheath is acuminate in dorsal view. The lancet lacks any lateral teeth.
Nematinus caledonicus larvae feed on birches.
Size: 6 - 7.5mm
Distribution: England, Scotland, Ireland
Flight period: May to June
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
Lindqvist, E. 1957. Zur Kenntnis der paläarktischen Nematinus-Arten (Hym., Tenthredinoidea). - Notulae Entomologicae, Helsingfors 37, 12-16
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
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.