WASHINGTON, April 26 (Reuters) - The U.S. and Taiwan will hold another round of negotiations toward their "21st Century" trade agreement starting on Monday in Taipei, the U.S. Trade Representative's office said on Friday.

The talks, led by USTR and the Taiwan Economic and Cultural Representative Office in the United States, are expected to discuss more complicated areas in their negotiating mandate that were not already agreed on previous negotiating rounds, including agriculture, labor, digital trade, environment, and state-owned enterprises. The trade talks will not cover tariff reductions between the U.S. and Taiwan. (Reporting by David Lawder)