Athalia ancilla
In this species the middle tibia is ringed with black apically and the length of the inner spur of the hind tibia is less than the length of the fourth tarsomere. The basal half of veins C+R are yellow.
Associated with wet places. Larvae feed on cruciferous plants such as hedge garlic and mustards.
Size: 5-7mm
Status: Locally common
Distribution: England, Scotland, Wales
Flight period: May to September
Plant associations: Cruciferae (crucifers: hedge garlic, mustards, etc)
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, 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
Palmer, D. and Palmer, J.P. 2015. Keys of species of Athalia in France and Italy, Flickr. [https://www.flickr.com/photos/d-jp-balmer/7996272718/in/photolist-9Ztf2g-dbAZi1-d8W2FW-9Zdz6n/] Accessed 16Apr2019