Urocerus albicornis

Introduced from North America but not known to be established. The female is a black wood wasp with white markings. The antennae are white with black segments basally and apically. White markings also behind the eyes and on the lateral faces of some tergites.

The male is like the female but with pale tergites in the middle of the abdomen.

Urocerus albicornis larvae feed in the timber of various coniferous trees including fir, larch, pine and cedar.

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Size: 12 - 40mm

Status: Introduced, not established

Distribution: England, Scotland

Flight period: June to October

Plant associations: Pinaceae (coniferous trees) (1) including...

Abies fraseri (Fraser fir) (3)
Abies lasiocarpa (subalpine fir) (3)
Larix laricina (American larch) (3)
Larix occidentalis (western larch) (3)
Picea engelmannii (Engelmann spruce) (3)
Picea glauca (white spruce) (3)
Picea mariana (black spruce) (3)
Picea sitchensis (sitka spruce) (3)
Pinus banksiana (jack pine) (3)
Pinus contorta (lodgepole pine) (3)
Pinus rigida (northern pitch-pine) (3)
Pinus sylvestris (Scots pine) (3)
Pseudotsuga menziesii (Douglas fir) (3)
Tsuga heterophylla (western hemlock-spruce) (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.