NEW YORK (AP) -- The Dow Jones industrial average dropped another 200 points today on fresh concerns about banks and about General Motors. In midday trading, the Dow is down 219.11, or 3.19 percent, to 6,656.73, a low not seen since April 1997. he Standard & Poor's 500 index dropped 26.09, or 3.66 percent, to 686.78. The S&P has not traded below this level since October 1996. The Nasdaq composite index fell 42.29, or 3.12 percent, to 1,311.45. Investors are having another change of heart and are selling stocks once again after a one-day burst of optimism fizzled.