Donnees biologiques et ecologiques sur les tiques de lagomorphes (et plus specialement celles du lapin de garenne, Oryctolagus cuniculus L.) dans les Alpes francaises et leur avant-pays. - In the french Alps and their surroundings, the ticks associated to Lagomorphs are either exophilous or pholeophilous species. Hares and rabbits have both sorne non-specifie species in common (Ixodes ricinus for example). The three rabbit s specifie species (Ixodes venta/loi, Haemaphysalis hispanica and Rhipicepha/ us pusil/us) are pholeophilous; yet the exophily of R. pusillus can occur so as the infestation of hares by this one is possible. The rabbit s specifie ticks differ from one another in their biology and ecology: modalities of seasonal activity, patterns of infestation, range of mammals able to act as secondary hosts, small mammals part into the cycle, distribution-species out of the Mediterrean-Area, ability or non-ability to colonize unnatural sets ... are so rouch characteristics able to differenciate the species and to have epidemiological consequences.