Pristiphora testacea - Species not placed in a group
Females have an entirely black underside to the thorax and an entirely black stigma. The abdomen is mainly yellow above and at least partly so beneath, and the sawsheath is also yellow. In the male, the mesopleura are black and the underside of the abdomen entirely pale. Males can also be determined by examination of the penis valves.
Pristiphora testacea larvae feed socially on silver birch and downy birch. They are green with a distinctive egg-yolk yellow spot on each segment just above the leg. The head is brown in early instars becoming black in maturity.
Size: 5.0 - 7.0mm
Distribution: England, Scotland, Wales, Ireland
Flight period: April to June and July to August
Plant associations: Betula pendula and Betula pubescens (silver birch and downy birch)
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., Kramp, K., Vikberg, V. and Liston, A., 2017. North-Western Palaearctic species of Pristiphora (hymenoptera, tenthredinidae). Journal of Hymenoptera Research, 59