MEXICO CITY, July 7 (Reuters) - Mexican stocks fell on Tuesday as talk of a second U.S. fiscal stimulus package sparked worries about the economic recovery in the United States, Mexico's top trading partner.

The IPC stock index .MXX closed down 1.61 percent to 23,359.94, marking its fourth day of losses. (Reporting by Michael O'Boyle; Editing by Dan Grebler)