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Up to 25mm long, the largest British Sawfly. The adult is easily recognised by the pale band on its shiny black abdomen. Wings are smoky brown colour with dark brown margins. The antennae are yellow tipped.
Favours habitats where Birch trees are found.
May to August
The solitary larvae feed on Silver Birch leaves between June and September and can grow up to 45mm in length. A black edged bluish stripe runs along the middle of the larva's back for the length of its body. There is a single row of black dots along the side of the body.
Local throughout Britain, not very common.
Uncommon in Leicestershire and Rutland.
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