Otherwise known as the cluster fly, came to my attention today as a great quantity fell out when the loft door was opened where I am staying.
An ancient family violin was being retrieved from the roof cavity but before we were able to inspect the condition of said instrument we were entertained by the dog,la Espagnol (Springer variety), scurrying around the cream carpet eating the dead and dying insects. She was shooed off with much fake vomming and retching from the assembled children before the remaining carcasses were sucked up for one final whizz round the storage cylinder of the vacuum cleaner.
As it turned out the violin, which in a Victorian version of brand piracy, has Stradivarius imprinted on its innards, is in a derelict sort of state with a broken fingerboard, displaced bridge and something rattling around inside it. Maybe it too swallowed a fly.