Males are not known. Antennae are longer than the thorax with the third segment at most 1.5 times as long as broad, but with the fourth and fifth segments each more than twice as long as broad.
Larvae mine the leaves of alder trees.
Size: 3 - 4mm
Distribution: England, Scotland, Wales, Ireland
Flight period: Bivoltine, May to June and August.
Plant associations: Alnus spp. (alder)
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