Jason,
If your Lhota's were in Pittsburgh, chances are your family was from Pechova Lhota, which is in the South Bohemia region of Czechoslovakia (it was Bohemia when your ancestors lived there).
You will probably find their graves in the St. Wenceslaus section of the St. Joseph cemetery in Ross township.
You will probably find their records from the Diocese of Pittsburgh Archives, in the records of St. Wenceslaus RC church which is (was) near the 16th street bridge on the North Side.
John LHOTA was one of the founders of St. Wenceslaus in 1871.
Do the surnames BASTYR or OPATRNY figure into your relatives?