Cordilura atrata
Quite a small black fly with completely black legs. Whole body thinly dusted with the black ground colour showing through especially on the top of the thorax and abdomen. Face and jowls more densely dusted. Front of the frons reddish. Palps black. Halteres yellow. Wing length: ♂ 3.8 - 4.1 - 4.6 mm (7); ♀ 4.3 - 4.6 - 4.8 mm (10).
Adults are usually found in wetland situations such as fens, marshes and stream-sides with records up to 910m. Most records are for June and July (but extremes 20.v - 3.ix).
A rare species which appears to be mainly confined to the Central and Northern Highlands of Scotland (Inverness, Perth, Aberdeen, East Ross, Sutherland), but with a single English locality: Moorhouse NNR (number of records in 1960s). Locally abundant at some localities in Speyside and with numerous records in the Killin district, Perthshire in the 1930s.
World distribution: Palaearctic: Belgium, Czech Republic, Finland, France, Norway, Slovakia, Sweden; Russia: Karelia, north European, east Palaearctic; Nearctic: Canada, USA.