Pristiphora geniculata - Species not placed in a group
The thorax and the abdomen are mostly black (completely on the sternites) and the hind femora are pale at the base and black at the apex. Males are best determined by examination of the penis valves.
Pristiphora geniculata larvae feed on mountain ash (including garden varieties such as Vilmorin's Rowan) and red chokeberry (where introduced).
Size: Females: 6.5 - 7.5mm, males: 5.0 - 7.5mm
Distribution: England, Ireland
Flight period: May to June and July to August
Plant associations: Sorbus species including Sorbus aucuparia, and also Aronia arbutifolia (mountain ash and red chokeberry)
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