Benjamin R. Williams appeals from the district court’s order denying his motion to modify the terms of his supervised release. A notice of appeal in a criminal case must be filed within ten days of the entry of judgment being appealed. Fed. R.App. P. 4(b)(1). The district court, upon a finding of excusable neglect or good cause, may extend the time period for filing a notice of appeal an additional thirty days. Fed. R.App. P. 4(b)(4). The appeal periods established by Rule 4 are mandatory and jurisdictional. Browder v. Dir., Dep’t of Corr., 434 U.S. 257, 264, 98 S.Ct. 556, 54 L.Ed.2d 521 (1978); United States v. Raynor, 939 F.2d 191, 197 (4th Cir. 1991). The district court entered its judgment on July 14, 2005, and Williams filed his notice of appeal on September 9, 2005, outside the thirty-day excusable neglect period. As Williams’ appeal is untimely, 1 we dismiss his appeal for lack of jurisdiction. 2 We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

DISMISSED