Wall St. ends slightly lower on energy, earnings

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 specter of higher interest rates hover over markets. Perrigo Co , down 18 percent after it lowered its adjusted profit forecast for the full year, was among the largest drags on the S&P 500.