Readily distinguished by its 4 scutellar bristles and the black spot near the base of the underside of each tarsal segment (examine carefully from behind). Body black, heavily grey dusted with the black ground colour shining through only on the sides of the thoracic dorsum and towards the base of the abdominal tergites. Femora black. Tibia and tarsi yellow. Front of the frons, sides of the face and mouth margin yellow. Frons heavily whitish-grey dusted, contrasting with the black orbits. Palps black. Wing length: ♂ 5.6 - 6.1 - 6.6 mm (9); ♀ 5.4 - 6.0 - 6.6 mm (7).