Niagara Falls - The Seneca Nation of Indians has not paid the state its share of slot machine revenue from last year, and some local leaders are getting anxious about when the money will arrive. The Senecas’ compact calls for paying the state 18 percent of net slot machine revenue on an “annual basis” for the first four years of casino operations, but it does not specify a date for the payments. That uncertainity has left city officials guessing when they will be able to spend their share.