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.
Size: 10 - 14mm.
GB IUCN Status: Regionally Extinct
GB Rarity Status: Extinct
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. https://doi.org/10.3897/BDJ.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 Natural England, unpublished