Stenurella melanura is a small longhorn beetle (6-10 mm). 
The male has yellow-brown elytra (wing cases) that are narrow black along the seam and at the end.
The female has red-brown elytra with a much wider black seam and tip. 
Males of its close relative Leptura bifasciata are similarly colored but have the underside of the abdomen red instead of black.

1st photo: Pfänder Mountain, Bregenz, Vorarlberg, Austria, 12 July 2013
2nd, 3rd & 4th photo: Together with Sicus ferrugineus (Thick-headed Fly sp.). Pfänder Mountain, Bregenz, Vorarlberg, Austria, 2 August 2020