Identification: Frons, occiput, thorax and abdominal tergites black. Dusting slight, some copper-coloured on mesonotum, pale on thoracic pleurae
Legs: Hind femora yellow with two narrow dark rings (apical and pre-apical). Fore coxa clear yellow, mid and hind coxae black with a cream coloured spot.
Wing: long, extending beyond the end of tergite 6. Halteres white.
Female abdomen: Colour pattern on the pleural membrane consisting of five brown (burnt umber) anterior patches on a cream-coloured belly.. Yellow margins to the rear edges of the tergites, broad on the hindmost tergite but becoming narrower on anterior tergites.
Male abdomen: Tergites black with narrow white hind margins. Pleural membrane not usually much visible in males.
Head: Face and genae entirely white dusted except for a slight yellowing just beneath the antennae. Antennal segments such a very dark brown that they could easily be mistaken for black. Arista white (dark at base).
Images: Stacked images of fresh specimens on Malcolm Storey's Bioimages and live specimens on Nikola Rahme's Flickr
Europe: Countries (published), online at Fauna Europaea, Occurrences at GBIF
UK: Recording Scheme map of occurrences 2016 (verified.) Online (NBN Atlas) via Easy maps or Interactive Atlas
Larvae have been reared from root nodules of several leguminous plant species (Ferrar 1987).
Adults are common, sometimes en masse, in habitats with host species, usually meadows and fields, resting on leaves of bushes and higher plants. (Jindřich Roháček, 1990)