Trachelus troglodyta - Hermit Stem-sawfly

Larger of the two species found in Britain. There are old records from the London area, Hampshire, west Cornwall and the most recent from Marlborough in 1925. Whilst dedicated survey effort has not been put into searching for the species, one would expect the species to be detected were it still present (Musgrove, 2022). Abdomen with yellow bands and wings yellowish with yellow veins and stigma.

Trachelus troglodyta larvae feed on rye. 

Jump to other Cephidae

Size: 10 - 14mm.

GB IUCN Status: Regionally Extinct
GB Rarity Status: Extinct

Distribution: England

Flight period: June

Plant associations: Secale cereale (Rye).


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. 2022. A review of the status of sawflies of Great Britain - Phase 1: families other than Tenthredinidae. Natural England, unpublished