P. niger can be separated from the other Phylloecus species by head and pronotum being dulled by dense punctures. The pronotum is entirely black. Abdomen usually with only two tergites banded apically with yellow, the rest of the abdomen being black.
The larvae inhabit the young canes of raspberries.
Distribution: England, Wales
Flight period: April to June
Plant associations: Rubus idaeus (raspberry).
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