The abdomen usually has tergites 2 to 5 banded reddish-yellow. The clypeus and labrum are black as are all the femora except at the extreme apex. The mesopleura are shiny and scarcely punctured.
Strongylogaster mixta larvae feed on lady fern and possibly other ferns. Late instar larvae are recognisable by the greenish grey ground colour on the upper surface and the presence of a black spot on the suranal lobe.
Size: 7 - 9mm
Distribution: England, Scotland, Wales, Ireland
Flight period: April to June
Plant associations: Athyrium filix-femina (lady fern)
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
Macek, J., 2010. Taxonomy, distribution and biology of selected European Dinax, Strongylogaster and Taxonus species (Hymenoptera: Symphyta). Acta Entomologica Musei Natioalis Pragae, 50(1).