Known in Britain only from specimens identified in the National Museum of Scotland Edinburgh. This species is within the immersa group along with immersa and fletcheri. The hind coxae, trochanters, and trochantelli are usually mostly black. The clypeus is entirely black and the hind femora are also mainly black. In the female the apical tergites and sternites are also black.
The larvae are unknown but adults are found in association with willows and birches.
Size: 6 - 7mm
Status: Data deficient
Flight period: April to June
Plant associations: unknown but possibly Salix spp. or Betula spp. (possibly willows or birches)
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
Liston, A. D. 2016: Empria camtschatica Forsius and Tenthredo semicolon Mol (Hymenoptera: Tenthredinidae) in the British Isles. - The Entomologist's Monthly Magazine, Brightwood 152: 131-135.
Prous, M. 2012: Taxonomy and phylogeny of the sawfly genus Empria (Hymenoptera, Tenthredinidae). - Dissertationes Biologicae Universitatis Tartuensis, Tartu 222: 192 pp.
Prous, M.; Blank, S. M.; Heibo, E.; Lönnve, O. J.; Taeger, A.; Vardal, H.; Liston, A. 2014: Sawflies (Hymenoptera, Symphyta) newly recorded from Sweden. - Entomologisk Tidskrift, Uppsala 135(3): 135-146.