A rare Red Data Book species, on chalk downland, south-facing hillsides, embankments, quarries and sea cliffs; 50-400 m (50-2800 m in Europe), in much of the British Isles; mainland Europe and Scandinavia. There are good populations in Hampshire on Martin Down and Portsdown Hill and on the Isle of Wight. Wingspan 16-24 mm. Larva feeds on Kidney Vetch, subsequently living underground where attended by ants.