MEMORANDUM **

Lewis Vincent Hughes and Dean A. Arp appeal pro se from the district court’s judgment dismissing their action for lack of subject matter jurisdiction. We have jurisdiction under 28 U.S.C. § 1291 and we affirm.

*471 Because Hughes and Arp have failed to address on appeal how the district court erred in dismissing their action, they have waived their challenge to the district court’s dismissal for lack of subject matter jurisdiction. See Smith v. Marsh, 194 F.3d 1045, 1052 (9th Cir. 1999) (“[O]n appeal, arguments not raised by a party in its opening brief are deemed waived.”).

We reject as meritless Hughes and Arp’s contention regarding the authority of the United States District Court for the Western District of Washington.

AFFIRMED.