Norellisoma lituratum
This is N. flavicorne of Collin, 1958[1], but there has been considerable confusion in the nomenclature between this species and N. opacum. A small dark coloured species with yellow legs, the front pair with double rows of strong black spines below the femora and tibia. The dark ground colour of the thorax and abdomen shines through the thin dusting which is only dense and grey on a fairly broad central stripe on the thoracic dorsum. Terminalia of both sexes undusted and shining black. Wing length: ♂ 3.2 - 3.5 - 3.9 mm (4); ♀ 3.8 - 3.8 - 3.8 mm (2).
References
This is a wetland species which can be swept from sedges and grasses. According to Smith (1989)[1] it is associated with meadowsweet (Filipendula) which, I think, stems from Yerbury (1900)[2] who records sweeping it frequently from this plant in Herefordshire and speculates that the larvae feeds in the stalk.
References
Widespread. Irwin (1975)[1] and Speight (1983)[2] record it from Ireland.
World distribution: Palaearctic: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Ireland, Netherlands, Norway, Poland, Slovakia, Spain, Sweden, Switzerland; Asia: Mongolia; Russia: European and eastern Palaearctic, White Sea.
References
- Recent records of dung-flies (Diptera, Scathophagidae) from Northern Ireland. Irish Naturalists Journal, 18, pp.188-189., 1975.
- Cordilura aemula and Microprosopa pallidicauda new to Ireland, Trichopalpus fraternus confirmed as an Irish insect and other Irish records of Scathophagidae (Diptera). Irish Naturalists Journal, 21, pp.165-167., 1983.