Rhadinoceraea micans (Schrank, 1781)

Rhadinoceraea micans

The flag iris sawfly. An entirely black species often seen flying around the host plant. Very similar to Phymatocera aterrima which feeds on Solomon's seal. In micans the antennae are about twice as long as the width of the head and about as long as the abdomen. In aterrima the antennae are at least three times as long as the width of the head and as long as the whole body.
The larvae feed on flag iris.

Size: 7 - 8mm

Status: Common

Distribution: England, Wales

Flight period: April to June

Plant associations: Iris pseudacorus. (flag iris)

References:

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