A Tenthredo species that looks very similar to the Rhogogaster viridis group. It can be distinguished by having a head and mesonotum coriaceous and evenly covered in short stiff black hairs. In Rhogogaster species these are shining with sparse pale hairs. The green colour on olivacea is a more drab olive rather than the vibrant green of Rhogogaster though it would be unwise to make a determination on this basis alone. The stigma and costa is green. The black markings on the upper head often have the appearance of a capital H taking in the two broad parallel side stripes that extend to the back of the head and a central transverse band taking in the hind ocelli.
Larvae feed on a range of herbaceous plants including buttercups, plantains, speedwells and chickweeds.
Size: 9 - 12mm
Distribution: England, Scotland, Wales
Flight period: May to July
Plant associations: Ranunculus (buttercups), Plantago (plantains), Veronica (speedwells), Myosotis (chickweeds)
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]