Butterfield Bank and KeyTech fell on the Bermuda Stock Exchange (BSX) yesterday.Butterfield slipped 5 cents, or 4 percent, to close at $1.20 on a volume of 5,000 shares.KeyTech dropped to $5.50, down 50 cents, or 8.3 percent, on a volume of 3,000 shares.BF&M shares were unchanged at $15.25 as 4,000 traded hands.Overall the BSX closed down 2.7 percent, or 29.89 points, at 1,066.88.