Bermuda Aviation Services Ltd took a dive yesterday, dropping 19.19 percent (95 cents) on The Bermuda Stock Exchange (BSX).The transport firm traded 2,000 shares to close at $4.The Argus Group Holdings Ltd also dropped 4.04 percent (20 cents) to $4.75 with 21,280 shares changing hands.But Butterfield Bank rose 0.72 percent (one cent) to $1.39 as 4,900 shares were transacted.The Index as a whole slipped three points (0.25 percent) to 1,190.65 with 28,180 shares worth $115,852 traded.The BSX Insurance Index also fell seven points (0.69 percent) to 1,009.