Female: The head is pale yellow with black patterns and the vertex sometimes has a greenish tinge. The thorax is black with yellow marks and the mesoscutellum and metascutellum are also yellow. The venation is brownish-yellow basally, darkening towards the apex. Stigma yellow with light brown markings. Abdomen is black dorsally with light brown laterally and along the midline of central tergites.
Males: Few specimens exist. The head is black dorsally and yellow anteriorly and laterally and with pale yellow stripes from the eye to the back of the head. The mesoscutellum and metascutellum are black but may be tinged yellow centrally. Venation as per the female. Abdomen more broadly black than the female.
Eggs are laid on the upper side of a leaf and covered in a clear mucus which hardens when dry to protect the egg. The larvae feed in conical leaf rolls.
Size: 11 - 13mm
Flight period: May to June
Plant associations: Populus tremula and occasionally Salix caprea (aspen and occasionally goat willow)
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.