Pristiphora armata - ruficornis group
This species cannot always be separated from Pristiphora leucopus. Males occur abundantly (rare in leucopus). In males, the entire abdomen is black including all sternites and the antennae are reddish-yellow. In the females, the femora are usually almost totally black. Determination of the females, is best done by examination of the saw.
Pristiphora armata larvae feed on hawthorns.
Distribution: England, Scotland, Wales, Ireland
Flight period: April to July
Plant associations: Crataegus spp. (hawthorns)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Grearson, K.J. and Liston, A.D., 2012. Review of seasonal polyphenism in the Symphyta (Hymenoptera), exemplified by Pristiphora leucopus (Hellén, 1948)(Tenthredinidae). Zootaxa, 3502, pp.72-88.
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, 59
Prous, M., Vikberg, V., Liston, A. and Kramp, K., 2016. North-western Palaearctic species of the Pristiphora ruficornis group (Hymenoptera, Tenthredinidae). Journal of Hymenoptera Research, 51