The Sensex at the Bombay Stock Exchange, which lost nearly 83 points in early trade today, lost further ground in late morning deals and was trading 165 points in the negative territory at 15,692, when reports last came in.After losing over 80 points in the past two sessions, the 30-share index fell further by 83 points in the first few minutes of trade, with capital goods, metals and banking stocks leading the fall.The wide-based National Stock Exchange Nifty index was trading 52 points down at 4,698 points.