The dark brown upper forewings are marked with relatively small white markings but can usually be separated from the Olive Skipper (Pyrgus serratulae) by a c-shaped white mark close to the costa and the reddish-brown, not olive green, colour of the under hindwings, with a large square pale spot close to the margin.
It is sometimes considered a subspecies of the Carline Skipper (P.carlinae) as the two are known to interbreed where their ranges overlap in the Alps but can usually be recognised by the prominent squarish, rather than c-shaped, white spot near the costa of the forewing and the usually deeper red-brown underwings.
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