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There are two Irish species active in autumn, B. lepidus and B. clavipes. Both have entirely black males, but in former the stigma in the wing should be dark and distinct, in the latter more vague and less dark. In various discussions with some people knowledgable about Bibionidae we never could decide whether these two represented real species or a darker and a paler form of the same species.

For the moment, let's keep this one in the books as B. lepidus (because from the picture the stigma appears to be dark and distinct).

The key to use is the one on Bibionidae and Scatopsidae by Freeman and Lane (1985) in the series Handbooks for the Identification of British Insects 9(7).