Wall St. opens lower as energy weighs

NEW YORK (Reuters) - U.S. stocks opened lower on Monday as volume returned to markets after the New Year holiday, with energy shares sliding again as crude prices fell to fresh 5-1/2 year lows.

The Dow Jones industrial average <.DJI> fell 57.51 points, or 0.32 percent, to 17,775.48, the S&P 500 <.SPX> lost 7.7 points, or 0.37 percent, to 2,050.5 and the Nasdaq Composite <.IXIC> dropped 26.28 points, or 0.56 percent, to 4,700.54.

(Reporting by Chuck Mikolajczak; Editing by Bernadette Baum)