Identify this bug?
Been watching this just now for about ten minutes on a 2" leaf amidst a clump of campanula. Never seen one before. It spent all it's time scurrying around in circles on the leaf occasionally stopping and rubbing it's legs down the long black shell thing. It didn't seem to be doing anything to the leaf, although maybe this behaviour means it WAS doing something. The lump is unusual to me. Does anybody know what it is and if it's good news or bad news? Have to admit, its movements were a bit creepy! I couldn't tell if it was in distress (due to the lump?) or if it normally would move in a disorientated way.