Cimbex femoratus (Linnaeus, 1758)

Cimbex femoratus

Usually a black, or reddish-brown bodied insect, though very rarely yellow forms occur. Males may have a red banded abdomen. The wings in both sexes have a clearly defined fuscous apical band. The pale cream membrane in the centre of the first tergite contrasts strikingly with the dark sclerotised portion.
Larvae feed on birches.

Size: 20 - 28mm

Status: Common

Distribution: England, Scotland, Wales, Ireland

Flight period: May to August

Plant associations: Betula spp. (birches)

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