
    CENTRAL NEW YORK FAIR BUSINESS ASSOCIATION; Citizens Equal Right Alliance; David R. Townsend, New York State Assemblyman; Michael J. Hennessy, Oneida County Legislator; D. Chad Davis; Melvin L. Phillips, Plaintiffs-Appellants, v. Sally M.R. JEWELL, in her official capacity as Secretary of the U.S. Department of the Interior; Michael L. Connor, in his official capacity as Deputy Secretary of the U.S. Department of Interior; Elizabeth J. Klein, in her official capacity as the Associate Deputy Secretary of the Interior; Franklin Keel, the Regional Director for the Eastern Regional Office of the Bureau of Indian Affairs; Chester McGhee, in his official capacity as Eastern Regional Environmental Scientist; Arthur Raymond Halbritter, as a real party in interest as the Federally Recognized Leader of the Oneida Indian Nation, Defendants-Appellees.
    
    No. 16-53-cv
    United States Court of Appeals, Second Circuit.
    December 9, 2016
    
      FOR APPELLANTS: James J. Devine, Jr., Esq., Oneida, New York.
    FOR APPELLEES: J. David Gunter II, William Lazarus, Ann Peterson, Steven Miskinis, U.S. Department of Justice, Environment & Natural Resources Division, Washington, DC, for the Federal Appel-lees.
    Peter D. Carmen, Meghan Murphy Beakman, Oneida Nation Legal Department, Verona, NY; Michael R. Smith, David A. Reiser, Zukerman Spaeder LLP, Washington, DC, for Arthur Raymond Halbritter.
    PRESENT: GUIDO CALABRESI, REENA RAGGI, GERARD E. LYNCH, Circuit Judges.
    
      
      . For the reasons stated by the district court, see Central N.Y. Fair Bus. Ass’n. v. Jewell, No. 6:08-CV-0660 LEK/DEP, 2015 WL 1400384, at n.1 (N.D.N.Y. Mar. 26, 2015), the Clerk of Court is directed to amend the caption as set forth above.
    
   SUMMARY ORDER

Plaintiffs appeal from the dismissal of certain claims and the award of summary judgment on others arising from the Department of the Interior’s (the “Department”) May 2008 decision, pursuant to 25 U.S.C. § 465 and 25 C.F.R. § 151, to accept into trust approximately 13,000 acres of land in New York State for the benefit of the Oneida Indian Nation. We review de novo the district court’s dismissal order and summary judgment awards challenging administrative agency action. See Nicosia v. Amazon.com, Inc., 834 F.3d 220, 230 (2d Cir. 2016); Karpova v. Snow, 497 F.3d 262, 267 (2d Cir. 2007).

1. Dismissal

In appealing the dismissal of their claims under 42 U.S.C. §§ 1981, 1982, 1983, and 40 U.S.C. § 523, and the denial of a motion for limited discovery, see Central N.Y. Fair Bus. Ass’n v. Salazar, No. 608-CV-660(LEK/DEP), 2010 WL 786526 (N.D.N.Y. Mar. 1, 2010), plaintiffs raise issues on appeal that were, at most, merely mentioned below, and that, even now, are not sufficiently developed or supported by coherent arguments. Accordingly, we deem those issues waived. See Bishop v. Wells Fargo & Co., 823 F.3d 35, 50 (2d Cir. 2016).

Plaintiffs’ separation-of-powers argument is also only mentioned in their opening brief, but it is the focus of their reply brief, which invokes Puerto Rico v. Sanchez Valle, — U.S. -, 136 S.Ct. 1863, 195 L.Ed.2d 179 (2016), to urge that we find the Department’s decision incompatible with fundamental notions of state sovereignty. This court recently ruled to the contrary, however, holding that “underlying principles of state sovereignty do not impair the federal government’s power under the [Indian Reorganization Act] to acquire land on behalf of the” Oneida Tribe. Upstate Citizens for Equality, Inc. v. United States, 841 F.3d 556, 570 (2d Cir. 2016). Sanchez Valle, which involves a sovereignty analysis unique to the context of double jeopardy, see 136 S.Ct. at 1870, does not counsel otherwise. Accordingly, this challenge fails on the merits.

Plaintiffs argue that individual defendant Arthur Raymond Halbritter should not have been dropped from the suit because he is not entitled to tribal sovereign immunity. The argument fails because the district court did not dismiss Halbritter on that ground, but rather pursuant to Fed. R. Civ. P. 21 (pertaining to joinder) upon concluding that the complaint contained no allegations against him. See Cent. N.Y. Fair Bus. Ass’n v. Salazar, 2010 WL 786526, at *14. We identify no abuse of discretion in that decision. See City of Syracuse v. Onondaga County, 464 F.3d 297, 307 (2d Cir. 2006) (observing that decisions pursuant to Rule 21 are subject to abuse-of-discretion standard). The same pleading failure would warrant dismissal pursuant to Fed. R. Civ. P. 12(b)(6). See Oneida Indian Nation of N.Y. v. City of Sherrill, 337 F.3d 139, 169 (2d Cir. 2003) (affirming Rule 12(b)(6) dismissal of claims against tribal officers, including Halbritter, where complaint contained no allegations of individual unlawful conduct), rev’d on other grounds, 544 U.S. 197 (2005). Plaintiffs’ reliance upon Michigan v. Bay Mills Indian Community, — U.S. -, 134 S.Ct. 2024, 188 L.Ed.2d 1071 (2014), in arguing to the contrary is misplaced. The proposition for which they cite the case—that “tribal immunity does not bar ... a suit for injunctive relief against individuals, including tribal officers, responsible for unlawful conduct,” id. at 2035 (emphasis in original)—does not absolve the plaintiff from the obligation to plead sufficient facts supporting a plausible claim against the individual, see Ashcroft v. Iqbal, 556 U.S. 662, 678-79, 129 S.Ct. 1937, 173 L.Ed.2d 868 (2009).

Accordingly, we uphold the challenged dismissal decisions.

2. Summary Judgment Claim

On appeal from an award of summary judgment on claims brought under the Administrative Procedure Act, we ordinarily “review the administrative record de novo without according deference to the decision of the district court.” Karpova v. Snow, 497 F.3d at 267. Plaintiffs’ argument that the district court erred in upholding the Department’s decision is not, however, grounded in the administrative record, nor do they identify any specific error in the Department’s reasoning. Rather, they argue that the Department lacked “authority” to take the land at issue into trust because it lacked federal jurisdiction over the land. That argument, as plaintiffs acknowledge, is foreclosed by precedent holding that the Oneida Nation was granted land as a federal reservation in 1794 and that this reservation was not disestablished by the 1838 Treaty of Buffalo Creek. See Upstate Citizens for Equality, Inc. v. United States, 841 F.3d at 562-63; Oneida Indian Nation v. Madison County, 665 F.3d 408, 443-44 (2d. Cir. 2011); Oneida Indian Nation of N.Y. v. City of Sherrill, 337 F.3d at 160-65.

We are, of course, “bound by the decisions of prior panels until such time as they are overruled either by an en banc panel of our Court or by the Supreme Court.” Oneida Indian Nation of N.Y. v. Madison County, 665 F.3d at 443 (internal quotation marks omitted). The Supreme Court cases plaintiffs cite to argue that our precedents were wrongly decided do not cast doubt on our determination that the Oneida Indian Nation maintains a federally recognized reservation. Nor are plaintiffs’ substantive challenges to our precedents availing. The cited August 1974 Nixon/Ford Administration legal memorandum does not persuasively reflect a decades-long conspiracy to conceal relevant facts from courts considering Oneida Indian Nation disputes. As for plaintiffs’ other historical arguments, they are improperly presented insofar as they rest upon documents with which plaintiffs unsuccessfully sought to supplement the appellate record. Plaintiffs’ challenge to the Department’s authority to issue the land-to-trust decision here thus fails on the merits. Accordingly, we will not disturb either that decision or the district court’s judgment upholding it.

We review plaintiffs’, appeal from the district court’s denial of their motion for reconsideration for abuse of discretion, see, e.g., Legg v. Ulster County, 820 F.3d 67, 78 (2d Cir. 2016), and identify none. Plaintiffs’ contention that the district court erred'in disregarding their constitutional challenge to 43 U.S.C. § 1457—raised for the first time in their motion for reconsideration— is meritless. The district court’s passing reference to that statute supported only the proposition that “[t]he Secretary is delegated broad authority over Indian affairs.” Pls’ App’x 3-4, 16. It was not, contrary to plaintiffs’ suggestion, a material ground for the court’s decision.

We have considered plaintiffs’ remaining arguments and conclude that they are without merit. Accordingly, the. judgment of the district court is AFFIRMED. 
      
      . Plaintiffs never explain how Sturgeon v. Frost, — U.S. -, 136 S.Ct. 1061, 194 L.Ed.2d 108 (2016), or Nebraska v. Parker, — U.S. -, 136 S.Ct. 1072, 194 L.Ed.2d 152 (2016), undermine the precedents they assail. Neither Supreme Court decision suggests reason to revisit City of Sherrill or Madison County.
      
     
      
      . Two prior panels of this Court concluded, after full briefing, that plaintiffs failed to demonstrate their entitlement to supplement the record with these documents under Fed. R. App. P. 10 or to have judicial notice taken of them.
     