The Royal Gazette/BSX Index dropped almost 2½ per cent after four stocks fell.Somers Limited was down $3, or 20 per cent, at $12 after 500 shares traded, while Argus Group Holdings Ltd, dropped 43 cents, or 14.3 per cent, to $2.57 after 63,100 shares changed hands.There was also a fall of $2.14, or 10.4 per cent, to $18.36 for BF&M Ltd after 1,312 shares were exchanged.Butterfield Bank was down 25 cents, or 0.7 per cent, at $33.75 after 1,726 shares traded. In New York, the bank’s shares were up 32 cents, or 0.94 per cent, at $34.33.The Royal Gazette/BSX Index was down 56.17 points, or 2.49 per cent, at 2,202.04, while the BSX Insurance Index was up 7.83 points, or 0.46 per cent, at 1,726.47.