Birthplace of Berardi-De Bonis family

I'm looking for the comune where my great grandfather Giuseppe Berardi was born. Giuseppe first married Luisa De Bonis who died in Italy about 1874. His father was Valerio Berardi and his mother Rafaela Pietrafesa. We think he was born near 1845 in somewhere near Pietragalla or Avigliano or Potenza.
We have an idea he came to Brazil near 1870. Married again Virginia Zijotti in 1890 and died in 1898 in Sao Carlos province of Sao Paulo, Brazil.