Section 43. Qualifications of voters and eligibility to office

Every male
  Seneca Indian of full age  residing  on  the  Allegany,  Cattaraugus  or
  Tonawanda  reservations,  whose  name shall appear on the last preceding
  census taken for the purpose of distributing the annuities  due  to  the
  said Indians, shall be a qualified voter at all elections or meetings of
  the  electors  of his nation; and shall be eligible to any office filled
  thereat, except that the marshals, peacemakers  and  councilors  of  the
  Seneca  nation shall be residents of the reservation for which they were
  chosen, and the peacemakers of the Tonawanda nation shall be chosen from
  among the chiefs thereof. If any person offering to  vote  at  any  such
  election shall be challenged as unqualified, the presiding officer shall
  determine by an inspection of such last preceding census, upon his right
  to  vote;  and if he is challenged on the ground of not being twenty-one
  years of age, such officer shall ascertain the fact by the oath  of  the
  person  offering  his  vote,  or  of  any other Indian, which oath he is
  authorized to administer.