Urocerus californicus - California Horntail
Britain is not part of the natural range of this western Nearctic species. Just two records of this species in imported timber in 1944, and London in 1969 (Musgrove, 2022).
A variable species in its native Americas. Generally, the female has an abdomen almost entirely black. The wings are yellow with yellow venation. The male is banded on the abdomen with light reddish-brown on segments 3 to 10.
Urocerus californicus larvae feed in the timber of coniferous trees especially pines.
Size: 12 - 40mm
GB IUCN Status: Not Applicable
GB Rarity Status: Not Applicable
Distribution: Not recorded
Flight period: June to October
Plant associations: Pinaceae including Abies concolor (Colorado White-fir), Abies lasiocarpa (Subalpine Fir), Larix occidentalis (Western Larch), Picea engelmannii (Engelmann Spruce), Picea sitchensis (Sitka Spruce), Pinus contorta (Lodgepole Pine), Pinus ponderosa (Western Yellow-pine), Pseudotsuga menziesii (Douglas Fir), Tsuga heterophylla (Western Hemlock-spruce).
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 Natural England, unpublished
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.