Abstract
occidentalis ssp. n. - The three species known to date are redescribed. The taxonomic importance of morphological characters is discussed; characters taken one by one are generally difficult to use, but the combination ofseveral characters can be used successfully for identification. No taxonomic change occurs in either A. alpinus alpinus (Yersin, 1858) or in A. a. italo-austriacus Nadig, 1987. A. apenninigenus (Targioni-Tozzetti, 1881) is redescribed; this species is shown to be limited to the Apennine mountains and is not present in the Alps as previously thought. The Alpine populations which were considered as A. apenninigenus actually belong to A. pusillus sp. n. (populations north of Susa Valley) and to A. baracunensis occidentalis ssp. n. (south of Susa Valley). A. b. baracunensis Nadig, 1987 is limited to a very small area near the Mon Viso Mountain. A distribution map shows the updated distribution ranges of these allopatric(-parapatric) taxa in the Alps and in the Apennine mountains.
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