Probably confined to the Cairngorm Plateau near the summit of Braeriach.
The female is a dull insect with heavy coriaceous sculpture all over and with wings that do not reach the apex of the abdomen. Predominantly black with a yellow head and mesonotum. Males can be identified by the heavy coriaceous sculpture on the head and thorax, small eyes and the shape of the penis valve.
The species is a high montane species of the arctic-alpine zone. Larvae are thought to feed on willows and probably dwarf willow.
Size: 5 - 6mm
Flight period: June to July
Plant associations: Salix spp., probably Salix herbacea (common)
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
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