Possibly less common than the similar Phylloecus linearis. The face has a few punctures (absent in linearis), an insignificant interantennal furrow and a fourth antennal segment at most 0.66 times the length of the third.
Phylloecus xanthostoma larvae inhabit the stems of meadowsweet.
Size: 12 - 18mm.
Distribution: England, Scotland, Wales
Flight period: May to August
Plant associations: Filipendula ulmaria (meadowsweet) (1)
(1.) Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
(2.) 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