Tenthredo velox has the antenna partly pale from the third segment underneath and, in the female, is ringed with pale apically. The stigma and costa are dark. The head and thorax has dense coiaceous surface sculpture. The female is mostly black bodied with reddish legs, whilst the male abdomen is red from the third tergite to the apex.
Larvae feed on a range of plants. Perhaps associated with upland areas.
Size: 8 - 11mm
Distribution: England, Scotland, Wales
Flight period: June to August
Plant associations: Polygonum bistorta (bistort), Senecio fuchsia (wood ragwort), Salix (willow), Alnus viridis (alder).
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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
Fekete, K. (2018) Beginner’s guide to identifying British Tenthredo, Natural History Museum, London. http://www.nhm.ac.uk/content/dam/nhmwww/take-part/identification-trainers/sawflies-guide-id-trainees.pdf [Accessed 26Apr2019]