Avidius Varus

Can you, or any of your readers, tell me who *Avidius Varus* was, referred to in the following passage: "Sed *Avidii Vari* illud hic valeat: 'Aut hoc quod produxi testium satis est, aut nihil satis.'" I find reference made to him as above, in one of the Smith manuscripts; but I cannot discover his name in any catalogue or biographical dictionary. Is he known by any other name?