in central Europe the flight period extends from the beginning of May to mid-July, rarely until the beginning of August. The annual flight period of a population is, however, much shorter and extends usually over a period of four weeks. Most of the butterfly observations is in June. The reports decrease towards the end of June. Typical egg-laying sites and caterpillar sites are exposed to strong sunlight, but are not only found on slopes facing south or west, but can also be on flat surfaces. They have little plant cover with high proportions of raw soil, rocks or weathered gravel. The sparse vegetation consists sometimes only from individual cinquefoil cushions. Also newly created embankments, e.g. in the course of road construction work from lime shards, are used as larval habitat after the host plant has settled. Even in the best of habitats, multiple butterflies are rarely seen. This is due on the one hand to the fast flight and the good camouflage of the butterflies when sitting, which makes them difficult to find, but on the other hand also to the low densities even in optimal habitats. Although in some parts of its range Pyrgus carthami is fairly common. The males show a sitting behavior when looking for a partner and after disturbance occupy their territories again, even if not always at the same seat guard. In their surroundings they regularly fly over sparsely vegetated areas. So far, only Potentilla incana has been documented as a larval food plant from Bavaria. In addition, oviposition observations have also been made of Potentilla verna agg. and Potentilla heptaphylla, which should also be used as food plants. Within the range of the species the larvae also feed on Alcea, Malva sylvestris, Potentilla pedata, Potentilla neumanniana, Potentilla argentea, Althaea officinalis, Althea hirsuta and Centaurea species. The egg-laying takes place preferentially on the underside of the leaf of Potentilla incana, which is proven in Bavaria from both main distribution areas in Main Franconia as well as the Middle Franconian Alb. While in Main Franconia pre-imaginal stadiums have so far only been obtained on this cinquefoil, which occurs here in larger populations, in the Middle Franconian Jura evidently Potentilla neumanniana and Potentilla heptaphylla are also used sporadically. In the latter region, Potentilla incana also occurs much less frequently and locally. In the Palatinate, eggs and caterpillars were also detected in an extremely xerothermic location on Potentilla