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.
Trichiosoma sorbi larvae feed on mountain ash.
Size: 15 - 22mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to July
Plant associations: Sorbus aucuparia (mountain ash)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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
Viitasaari, M. 1989: Taxonomic notes on the genus Trichiosoma Leach (Hymenoptera, Cimbicidae) II. - Annales Entomologici Fennici, Helsinki 55 (3): 111-129