Tremex fuscicornis - Dark-horned Trembling Woodwasp

The only record indisputably relates to a human-mediated translocation: one found alive in a consignment of glass imported from Italy (Musgrove, 2022). The natural range of this species extends from much of Europe across to China. The species is not though to be established in Britain or Ireland. All specimens should be examined to rule out other possible imported Tremex species. 

The antennae of Tremex species are short by comparison to other Sirid wood wasps. There is some variation in colour within this species. 

Tremex fuscicornis larvae feed inside timber of dead and dying deciduous hardwoods. Larval development lasts 2 or 3 years and may pass through 11 instars.

Jump to other Siricidae species

Size: 20 - 30mm

GB IUCN Status: Not Applicable
GB Rarity Status: Not Applicable

Distribution: England

Flight period: June to October

Plant associations: Hardwoods including  Acer negundo (Ashleaf Maple), Robinia pseudoacacia. (False Acacia),  Populus nigra. (Black Poplar).


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.

Liston, A. D. 1995: Compendium of European Sawflies. List of species, modern nomenclature, distribution, foodplants, identification literature. - Gottfrieding, Chalastos Forestry : 1-190

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 Natural England, unpublished

Schiff, N.M., Goulet, H., Smith, D.R., Boudreault, C., Wilson, A.D. and Scheffler, B.E., 2012. Siricidae (Hymenoptera: Symphyta: Siricoidea) of the western hemisphere. Canadian Journal of Arthropod Identification 21: 1-305, 21, pp.1-305.