Hong Kong stocks returned from a long weekend to end Tuesday lower, with southbound buying by mainland Chinese investors dented by a decision to drain liquidity from local markets by the People's Bank of China. The Hang Seng Index fell 0.71 percent, or 203.60 points to 28,638.53. The benchmark Shanghai Composite Index dropped 0.92 percent, or 33.19 points, to 3,556.56, while the Shenzhen Composite Index on China's second exchange eased 0.83 percent, or 20.02 points, to 2,387.91. dan/reb