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<em>Philorhizus</em> <em>occitanus</em> sp. n. from the South-Western Alps (Ellero Valley and Maira Valley) is described. This new species is similar to <em>P</em>. <em>crucifer</em> and <em>P</em>. <em>notatus</em> as far as the external morphology is concerned, but it is distinguished by the color pattern and the shape of elytra, as well as by the features of the median lobe of aedeagus. <em>P</em>. <em>liguricus</em>, which is easily distinguished from <em>P</em>. <em>occitanus</em> sp. n. by the external morphology, was already recorded from the South-Western Alps and from the Ligurian Apennines. P<em>.</em> <em>occitanus</em> sp. n. is a likely close relative of <em>P.</em> <em>notatus</em>, although the affinities of this relict flightless new species remain uncertain.