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Data concerning a new population of Papilio alexanor Esper, 1800 (Lepidoptera Papilionidae) observed by the author in north-western Italy is here reported. In summer 2020, seventyfive caterpillars of this rare and emblematic species have been found in the upper Susa Valley (Cottian Alps) on Ptychotis saxifraga, at relatively high altitude. The analysis of the observations carried out on a random sample of host plants suggest similar ecology but delayed phenology, compared to that reported for other Italian populations.

biodiversity journal

New distributional data of the protected butterfly Papilio alexanor Esper, 1800 in north-western Italy and some ecological observations (Lepidoptera Papilionidae)