Snapping a four-day rally, the BSE benchmark Sensex on Monday fell over 34 points from its 19-month high to close at 19,305.32 as investors adopted a cautious stance ahead of the key vote on FDI in Parliament and mixed trends from global stock markets.Selling was seen in front-line stocks while second-line stocks attracted good buying support.The Bombay Stock Exchange 30-share barometer initially showed some strength but turned negative soon after. It moved in a narrow range, mostly in negative terrain, to settle at 19,305.32, a fall of 34.58 points or 0.18 per cent.The broader 50-issue S&P CNX Nifty of the NSE also eased by 8.90 points, or 0.15 per cent, to close at 5,870.95.Lack of a clear direction from global stocks also did not help domestic market sentiment as Asian stocks ended mixed while European indices were trading higher in afternoon deals.