U.S. stocks fell on Tuesday as a string of disappointing earnings at home and abroad weighed on the major indexes. DuPont Co., the No. 2 U.S. chemicals maker, fell 1.7 percent to $47.74 after it posted higher first-quarter profit, but the results fell short of Wall Street expectations. Lexmark International Inc., the No. 2 U.S. printer maker, slumped 10 percent to $70.30 after it reported results that fell short of analysts' expectations due to slack demand and lower printer prices. Rival Hewlett-Packard Co. was down 3.2 percent at $20.42. The Dow Jones industrial average was down 31.93 points, or 0.31 percent, at 10,210.54. The Standard & Poor's 500 Index was down 3.51 points, or 0.30 percent, at 1,158.59. The technology-laced Nasdaq Composite Index was down 8.24 points, or 0.42 percent, at 1,942.54. On the economic front, investors will look for clues about consumer spending, an important stimulus for growth. Consumer confidence data for April is due at 10 a.m. (1400 GMT), with economists forecasting a drop to 98 from 102.4 in March. --More 2256 Local Time 1956 GMT