Nematus brischkei Zaddach, 1876

Nematus brischkei (formerly Craesus brischkei)

One of four Nematus species in Britain and Ireland characterised by the enlarged basitarsal segment. This species is shining in the centre of the upper part of the mesopleura with the punctures clearly discernible amongst very fine microsculpture (Nematus alniasti lacks microsculpture here). The femora are mainly black. Males are unknown.
Larvae feed on hornbeam and hazel.

Size: 7 to 8mm

Status: Rare

Distribution: England

Flight period: May to June

Plant associations: Carpinus spp. and Corylus spp. (hornbeams and hazels)

References:

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