Hemichroa australis (Serville, 1823)

Hemichroa australis

In the female, the head and mesonotum and the underside of the antennae are orange-red whilst the underside of the thorax and the abdomen are entirely black. The costa is yellow with the stigma and remaining venation dark. In the male, the antennae are similarly red below and with a dark stigma.

Larvae usually feed singly on the leaves of alder or birch.


Size: Female: 5 - 8mm, male 5 - 6mm

Status: Widespread

Distribution: England, Scotland, Wales, Ireland

Flight period: Bivoltine, May to June and July to August

Plant associations: Alnus spp. and Betula spp. (alders and birches)


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