Female: The head is mottles black and yellow and the thorax is black with a yellow pattern dorsally. Abdomen may be almost entirely black above but often with the midline of tergites 4 and 5 brownish and the apical tergite yellow. Occasionally the abdomen is almost entirely brown above. The stigma is brownish-yellow.
Male: The head is patterned with black and yellow and the abdomen is black with the midline of tergites 4 and 5 brown and brown lateral faces.
Larvae feed in twist-like leaf rolls of birch leaves.
Size: Male: 7 - 11mm, Female: 8 - 12mm
Status: Uncommon, but widespread
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June
Plant associations: Betula spp. (birches)
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. ed., 2002. Sawflies (Hymenoptera, Symphyta), I: a review of the suborder, the Western Palaearctic taxa of Xyeloidea and Pamphilioidea. Tremex Press.