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Update:

-1) I checked my G. cathaginiensis. In all cases, tergite 3 lacks any trace of black apical border. Therefore, this specimen above must be G. inconspicua indeed.

-2) G. inconspicua has been treated with picture by Cerretti in his Italian monograph

-3) According to Herting (1984), G. inconspicua occurs from Spain via Turkey to Mongolia. So widespread, but very rare everywhere.