A rather drab but nevertheless distinctive species. This species has an overall black and tan colour scheme. In the darkest forms the thorax is all black as is the abdomen but the legs, wings, stigma and sides of the abdomen are a rather weak orangy brown to off-white. Very variable such that the thorax may be almost entirely orange-brown. Tegulae and pronotum are usually orange-brown in all forms. This is a parthenogenic species with males unknown.
Mesoneura opaca larvae feed on oaks.
Size: 6 - 7mm
Distribution: England, Scotland, Wales, Ireland
Flight period: April to June
Plant associations: Quercus spp. (oaks)
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