Pachyprotasis rapae (Linnaeus, 1767)

Pachyprotasis rapae

Abdomen mostly black above and with dark stigma. The underside of the abdomen is extensively white. The tergites either have black apical margins, or else have narrow white margins that do not broaden on the mid-dorsal line. 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.

Pachyprotasis rapae larvae feed on a broad range of plants.

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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