The abdomen is mostly black dorsally but most of the underside of the body and the legs is green. On the forewing the stigma is dark.
Pachyprotasis antennata larvae feed on ash or meadowsweet.
Size: 8 - 9mm
Status: Locally common
Distribution: England, Scotland, Wales, Ireland
Flight period: June to July
Plant associations: Filipendula spp. (meadowsweet) and Fraxinus spp. (ashes)
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