There is suspicion that Athalia circularis maybe a complex of species, each with a narrower larval food plant range. The middle tibia maybe ringed with black apically but the fore tibia are always entirely yellow. The length of the inner tibial spur of the hind leg is greater than the length of the fourth tarsomere of that leg. Vein C of the forewing is yellow for no more than the basal third. [Note that the similar Athalia longifoliae is present on the near continent and the two can only be separated by the male genitalia.]
Larvae feed on a variety of herbaceous perennials including ground ivy, plantains and speedwells and often in wet places.
Distribution: England, Scotland, Wales, Ireland
Flight period: May to October
Plant associations: Glechoma hederaceum, Lycopus spp., Plantago spp., Veronica spp. (ground ivy, gypsywort, plantains and speedwells)
Balmer, D. and Balmer, 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
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
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Mol, A.W.M., 2009. Athalia longifoliae sp. rev., stat. nov., new for the Netherlands and Germany (Hymenoptera: Tenthredinidae). Nederlandse Faunistische Mededelingen, 31, pp.43-52.