Trichiosoma sorbi Hartig, 1840

Trichiosoma sorbi

Mostly in the west and north of Britain and Ireland. In the female, the final 4 segments are adorned with closely adpressed silky white hairs giving a mouldy appearance. The male is difficult to separate from vitellinae but has a less rufous abdomen and with a less densely pubescent scutellum. The hind femur of the male has mostly dark hairs dorsally.

Larvae feed on mountain ash.

 

Size: 15 - 22mm

Status: Local

Distribution: England, Scotland, Wales, Ireland

Flight period: May to July

Plant associations: Sorbus aucuparia (mountain ash)

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