Elections
(1) The President, by public notification (consulting the Governor for a State), specifies which tribes/tribal communities (or parts/groups within them) are deemed "Scheduled Tribes" for that State/UT. (2) Parliament may by law add to or remove from this list, but no other authority can vary a notification once issued.
This mirrors Article 341 exactly, for Scheduled Tribes: the official list is created by presidential notification and can only be changed by Parliament, not unilaterally by the President or any state government afterward.
This is why a community claiming Scheduled Tribe status must show it's included in the specific presidential notification for that state - inclusion or exclusion of a particular tribal community from the list requires an Act of Parliament, not simply an administrative decision.