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It is B. venosus. But this species has already been recorded from Italy (Trentino-Alto Adige) by Vanin (2006: Phenological and altitudinal distribution of Bibionidae in Southern Alps. Studia dipterologica 13: 11-18).
An updated checklist of Bibionidae of Italy can be found in Haenni (2008: Diptera Stelviana. Vol. 1. Studia dipterologica Suppl. 16: 141-146).