Athalia bicolor Serville, 1823

Athalia bicolor

Top of the head and the thorax (except tegulae and hind edges of pronotum) entirely black. The first tergite is also black. Only the hind legs have black rings on the apices of the tibiae and tarsi, the other legs being entirely yellow.
Larvae are unknown but thought to be associated with buttercups.

Size: 5-7mm

Status: Locally common

Distribution: England, Wales

Flight period: May to August

Plant associations: Ranunculus spp. (buttercups)

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