Pachyprotasis rapae (Linnaeus, 1767)

Pachyprotasis rapae

Abdomen mostly black above and with dark stigma. The underside of the abdomen is extensively white. The mid-dorsal line of the tergites lacks any white on the apical margins that is broader there than on the lateral edges. The species has a diagonal median black stripe in addition to the black margins and a black sterno-pleural longitudinal band. The similar Pachyprotasis similans and variegata lack the diagonal stripe.
Larvae feed on a broad range of plants.

Size: 7 - 8mm

Status: Common

Distribution: England, Scotland, Wales, Ireland

Flight period: May to July

Plant associations: Betonica spp., Scrophularia spp., Solidago spp. and Fraxinus spp. (betony, figwort, golden rod and ash)

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