Family Tenthredinidae (Common sawflies) » Nematus umbratus Thomson, 1871
The adult flies May to June, July to September, and is associated with birches, elms, hazel and alders, which the larvae feed on. Widspread but rare.
Found on Hazel (Corylus avellana), back garden, South Staffordshire. 13th June 2017. Photos © Peter Hillman. Species identification confirmed and recorded by an expert from iRecord.