Sirex areolatus

Native to North America and probably only found in Britain when emerging from imported timber. Adult have predominantly blue-black legs, head, and thorax. The female abdomen is wholly blue-black and in the male it is black only on the basal and apical abdominal segments, with the central tergites being red-brown. The wings are smoky to violaceous.

Sirex areolatus larvae feed in timber of various non-native coniferous species for up to 3 years.

Jump to other Sirex species

Size: Approx. 10 to 40mm

Status: Common

Distribution: England (not established)

Flight period: June to October

Plant associations: Pinaceae spp. (pines, cedars, junipers, firs, redwood) incl...

Cupressus macrocarpa (Monterey cypress) (3)
Calocedrus decurrens (Californian incense-cedar) (3)
Sequoia sempervirens (coastal redwood) (3)
Thuja spp. (white-cedar and red-cedar) (3)
Taxodium distichum (swamp cypress)(3)
Pinus contorta (lodgepole pine) (3)
Pinus radiata (Monterey pine) (3)
Pseudotsuga menziesii (Douglas fir) (3)

References:

1. Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

2. 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

3. 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.