Pyrgus cacaliae is comparatively large and the white spots on the upper side of the forewing are greatly reduced.

The hind wing underside has a faded olive-green color with a long and a short point on the inner edge (similar to an exclamation mark).

The head and wing sheaths of the pupa are bluish with frosting; in the case of the abdomen, which is brown in its basic color, only the segment boundaries are left out.

[1] The species is widespread in the Central Pyrenees and from the western to the eastern Alps (from France to Italy, Switzerland, Germany and Austria).

[1] On the one hand, Pyrgus cacaliae colonizes humid habitats such as rye bushes along streams, peatlands and springs.

In Bavaria this species is recorded at altitudes of 1500–2300 m.[1] The flight period in the Bavarian Alpine region extends from the end of June to the beginning of August.

[1] According to the current state of knowledge, the species is not endangered in the Alps, as the occurrence of Pyrgus cacaliae is mostly outside of agricultural areas or on extensively grazed mountain pastures.