150 sites with occurrence of S. alpestris were surveyed in Switzerland and new records integrated in an actualized distribution map comprising 322 localities. The sp. only occurs in the alpine region and is not found in the Jura mountains. The data on the vertical distribution are summarized in altitude and climatic categories, differentiated with respect to records of adults and findings of exuviae. Imaginal and larval habitats of the sp. are described inch structural, phytosociological and hydrochemical characteristics of the breeding sites. Possible ecological factors limiting the upper and lower vertical distribution are discussed. The status of the sp. in Switzerland is assessed and conservation measures are suggested.