This fly with stripy eyes is about 75ml long. Beautiful shiny metallic colours, with black and white front legs, yellow/gold other legs. It was picking up one front leg, waving it in the air, put it down and repeat with the other front leg, put it down and wave its haltere's. Then repeat the whole process."Physiphora aenea, which more recent references say is a synonym for Physiphora alceae, and Physiphora demandata, likewise said to be a synonym for Physiphora clausa" bugguide.net/node/view/33447 See information from Tony below. More photos of these here
This distinctive fly is sometimes called the Nest Skipper Fly. The larvae are parasites of birds, sucking the blood of nestlings. It has been found in nests of various birds, e.g. Greenfinches, Chaffinches, Linnets, Thrushes and Blackbirds. The name Skipper refers to the ability of the maggots to jump or skip several cm by bending then suddenly straightening. I found this specimen in my conservatory.ID confirmed by Tony Irwin, see www.dipteristsforum.org.uk/viewtopic.php?pid=13659There are currently no records for this species on the NBN Gateway for East Suffolk and only one in the whole of the county.The details of this record are:Neottiophilum praeustum (female)Ipswich, East SuffolkTM1664450229-Apr-2014indoorsFound by Martin CooperDetermined by Tony Irwin