5-7mm. This sawfly is black with a bright red thorax. It also has black femora (thighs) and then paler legs. It is sometimes referred to as the Lawn Sawfly but this isn't a widespread name.
It flies from May
Larvae feed on grasses of the Poa family.
Fairly frequent especially in southern Britain
Common in Leicestershire and Rutland.
Leicestershire & Rutland Map
Enter a town or village to see local records
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015