Shares in Butterfield Bank and Argus Group traded lower yesterday on the Bermuda Stock Exchange.Argus shares fell 4 cents, or 1 percent, to finish at $4.16 on a volume of 4,300.Butterfield shares dropped 1 cent, or 0.9 percent, to $1.14 on a volume of 176.Watlington Waterworks shares also traded, closing unchanged at $11.70 on a volume of 75.Overall the BSX closed down 0.52 percent, or 5.46 points, at 1,039.19.The BSX Insurance Index closed down 3.00, or 0.30 percent, at 1009.00.