Recherches sur les Trichoptères du Liban et principalement des bassins supérieurs de l’Oronte et du Litani (Insecta: Trichoptera)

The adult and “metamorphotype” Trichoptera collected in the upper hydrographie bassins of the Oronte and of the Litani (Békaa Valley, Lebanon) were studied. The collected species are listed with taxonomical and distributional remarks; the caddisfly fauna of this zone is distinct from that of the small Lebanese coastal rivers as well as from the fauna of the upper Jordan system, despite the short distances between these areas. Three new species are described: Hydroptila fonsorontina, Oxyethira assia, and Hydropsyche longindex. Notes on the zones (in a longitudinal system of running water zonation), inhabited by the different species, are supplied.