Sorry!. No Jamaican ADRs trade on the US exchanges or OTC markets as of July, 2015.
Jamaica Dividend Withholding Tax Rates for US investors as of Jan,2016:
1.Dividend Withholding Tax for Regular Accounts: 33.3%
2.Dividend Withholding Tax for Retirement Accounts (401K, Roth IRA, Traditional IRA, etc.): 33.3%
Also checkout: The Components of the Jamaica Market Index
A beach in Jamaica