Pachyprotasis nigronotata
A largely green species which can be distinguished from the similar Pachyprotasis antennata by the green stigma (black in antennata). Known from a single specimen in Wales in 1941.
Larvae feed on a variety of herbaceous plants.
Size: 7 - 9mm
Status: Very rare
Distribution: Wales
Flight period: June
Plant associations: Mentha aquatica, Alchemilla spp., Geum spp. and Plantago spp. (water mint, lady's mantle, avens and plantains)
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