The female has yellow on the temples. The abdomen is greenish-white below and laterally but darkened dorsally with pale margins to each tergite. The hind femora are infuscated to some degree.
Males are not described in Britain.
Euura semilactea larvae feed on eared willow, goat willow, grey willow and creeping willow.
Size: Female: 6.5 - 7.5mm.
Flight period: May
Plant associations: Salix aurita, Salix caprea, Salix cinerea and Salix repens (eared willow, goat willow, grey willow and creeping willow)
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
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63-127