Pristiphora subarctica - Pristiphora pallida group
The sawsheath is bulbous basally, tapering to the apex. The femur is yellow or infuscated on the underside. In the males, the underthorax has at least the mesepimeron infuscate. Males can be distinguished by the penis valves.
Pristiphora subarctica larvae feed on Norway spruce.
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Size: Female: 5.0 - 6.0mm, male: 4.0 - 5.0mm
Status: Scarce
Distribution: England
Flight period: Assumed April to May
Plant associations: Picea abies (Norway spruce)
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References:
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.D., 1981. Pristiphora (Lygaeophora) lanifica (Zaddach, 1882) new to Britain (Hymenoptera: Tenthredinidae). Entomologist's gazette.
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
Prous, M., Kramp, K., Vikberg, V. and Liston, A., 2017. north-Western Palaearctic species of Pristiphora (hymenoptera, tenthredinidae). Journal of Hymenoptera Research, Vol. 59