Pachyprotasis variegata - Variegated Strider

Recorded widely but locally across much of mainland Britain (Musgrove, 2023).

Three predominantly black and white Pachyprotasis species in Britain and Ireland can cause confusion; rapae, variegata and simulans.

Females of variegata are readily distinguished through having a red hind femora and tibia. Males are more difficult to separate. Males of variegata and similans lack a diagonal black stripe on the mesopleura (present in rapae) though the mesopleural margins may be darkened and there is a black band where the mesopleuron meets the mesosternum. The frons in variegata is dull with fine coriaceous sculpture between dense but shallow punctures (shining with only faint sculpture in simulans).

Larvae probably feed on a wide range of herbaceous plants but have been found on potato crops and on the continent on foxgloves.

Jump to other species of Pachyprotasis

Size: 8 - 9mm

Status: Least Concern
Status: None

Distribution: England, Scotland, Wales

Flight period: May to June

Plant associations: Solanum tuberosum, Digitalis sp. and probably a wide range of others (potatoes, foxglove)


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.

Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished