Males are rare. Antennae no longer than the thorax with the third segment twice as long as broad, but with the fourth and fifth segments each less than twice as long as broad.
Fenusa pumila larvae mine the leaves of birch trees with a preference for downy birch.
Size: 2.5 - 3.5mm
Distribution: England, Scotland, Wales, Ireland
Flight period: Bivoltine, May to June and July to August.
Plant associations: Betula spp. esp. Betula pubescens (birch esp. downy birch)
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