Xiphydria camelus (Linnaeus, 1758)

The alder wood-wasp is one of three species in the genus in Britain. Xiphydria camelus and longicollis have the abdomen entirely black dorsally. All three species have lateral white spots on the abdomen. In camelus the antennal second segment is clearly shorter than the fourth segment. The hind basitarsus about the same length as the following three segments combined.
Larvae bore into the wood of ailing alders and birches in wetland habitats.

Size: 10 - 21mm

Status: Local

Distribution: England, Scotland, Wales

Flight period: May to August

Plant associations: Alnus spp., Betula spp. (alders and 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

Shaw, M. R. & Liston, A. D. 1985: Xiphydria longicollis (Geoffroy) (Hymenoptera: Xiphydriidae) new to Britain. - Entomologist's Gazette, Faringdon 36: 233-235