Adult Hemichroa australis can reach a length of about 7 to 8 mm. The adult sawfly is largely back with an orange head and thorax. The larvae feed on the leaves of Birch and Alder. When feeding, young larvae make holes in characteristic curved or angled lines in the leaves, whereas larger larvae feed on leaf edges.

Associated with Alder and Birch.

Feeding larvae can be encountered when the host species are in leaf

Associated with Birch and Alder.

Widespread in England and Wales but true status is difficult to determine due to lack of records.

Previously thought uncommon in Leicestershire and Rutland, but almost certainly under recorded. The Dunton Gorse record of 6th September 2017 may be the first for VC55.

https://www.sawflies.org.uk/hemichroa-australis/