Wall Street ends slightly lower on energy, earnings

Energy shares dragged Wall Street slightly lower on Monday, tracking a decline in oil prices, while earnings and guidance from companies including Perrigo and Xerox also weighed on U.S. stocks. With the S&P 500 up in eight of the past 10 weeks and nearing the record high set almost a year ago, traders are struggling to find reasons to push it even higher as underwhelming earnings and the spectre of higher interest rates hover over markets. Perrigo Co , down 18 percent after it lowered its ad