A large yellow and brown species very similar to Cimbex luteus. However, Cimbex connatus is a darker insect with dark marking on the first three tergites. In luteus the 3rd tergite has at most a narrow central dark mark and with much more extensive yellow on the underside of the abdomen. In connatus, the thorax is generally a darker orange colour and the back of the head and scutellum are shinier with less puncturation and fewer hairs.
Larvae feed on alders.
Size: 20 - 28mm
Distribution: England, Wales, Ireland
Flight period: May to June
Plant associations: Alnus spp. (alders)
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