Pristiphora wesmaeli - Pristiphora erichsonii group
This species is so similar to Pristiphora glauca that adults cannot often be distinguished. Even the genitalia are hard to distinguish. The later emergence of adults and later larval feeding period is thought to be a more reliable method of distinguishing between the two species.
Pristiphora wesmaeli larval food plant is European larch and Japanese and Dahurian larch were introduced.
Size: 6.0 - 7.5mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to July
Plant associations: Larix decidua, Larix kaempferi and Larix gmelinii (European larch, Japanese larch and Dahurian larch)
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
Prous, M., Kramp, K., Vikberg, V. and Liston, A., 2017. north-Western Palaearctic species of Pristiphora (hymenoptera, tenthredinidae). Journal of Hymenoptera Research, Vol. 59