opinion: Per Curiam.
  In this appeal from a judgment of the Supreme Court of California, appellants challenge the constitutionality of the promulgation by appellee of certain rate tariffs applicable to dump truck carriers operating in California. They contend essentially that the tariffs violate their rights to due process and equal protection guaranteed by the Fourteenth Amendment because appellee issued them on the basis of findings unsupported by any evidence in the record. We have been informed by the parties that subsequent to the filing of the jurisdictional statement with this Court appellee reopened its proceedings at appellants’ request and is conducting additional evidentiary hearings concerning the contested regulations. These hearings may remove the basis for, or significantly alter the nature of, appellants’ constitutional attack. Consequently, we dismiss the appeal without prejudice to appellants’ raising of any appropriate federal claims following the completion of the additional proceedings. See Boston & M. R. Co. v. United States, 358 U. S. 68 (1958).
  So ordered.
choices: case did not arise on cert or cert not granted federal court conflict federal court conflict and to resolve important or significant question putative conflict conflict between federal court and state court state court conflict federal court confusion or uncertainty state court confusion or uncertainty federal court and state court confusion or uncertainty to resolve important or significant question to resolve question presented no reason given other reason