Tenthredo colon Klug, 1817

Tenthredo colon

One of five Tenthredo species with a band of white antennal segments: colon, fagi, ferruginea, livida, semicolon. In colon and semicolon the white is confined to at most segments six to eight. The stigma of the forewing is unicolorous brown and the costa yellowish-brown. The scutellum is black and never white marked. The mesopleura and lateral face of the first tergite are each white marked. The head above is mostly impunctate and shining black.
Tenthredo semicolon has previously been confused with colon but can be separated by having less sculpture on the mesopleura and mesosternum giving semicolon a more shiny appearance.
Larvae feed on a broad range of plants.

Size: 10 - 12mm

Status: Local

Distribution: England, Scotland, Wales, Ireland

Flight period: May to August

Plant associations: Circaea lutetiana (Enchanter's Nightshade), Epilobium hirsutum (Great Willowherb), Pteridium aquilinum (Bracken), Fuchsia spp. (Fuschias) and Salix spp. (Sallows, Willows)

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

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]