The onshore yuan slipped 0.17 percent to 6.8402 per dollar as of 4:02 p.m., while the Shanghai Composite Index closed down 1.3 percent at its lowest since February 2016. The ChiNext gauge of small caps and tech stocks fared even worse, tumbling 2.8 percent -- its worst day in seven weeks -- to its lowest in nearly four years. The Hang Seng Index, which fell every day last week, held a 0.6 percent gain.