You may be under the impression that a fly is a fly, but this is not true. A drain fly, also known as a sewer fly, has a moth-like appearance with fuzzy wings, antennae, and … While visually distinct, both pests are tiny at about one-eighth of an inch long. Physical Features. Houseflies are more common than cluster flies and grow between 5-7mm in length. October 6, 2014. The body of a cluster fly will be black with a silver checkered pattern. SIZE AND COLOR: Cluster flies are larger than house flies at approximately 7mm long compared to the 3-6mm length of a house fly. AND NO PPL IT IS NOT A BOT FLY OR A TSE TSE FLY I LOOKED ON THE INTERNET IT LOOKS LIKE A COMMON HOUSE FLY JUST LARGER AND SHINY BLUE. Learning the difference between a drain fly and a fruit fly is the first step toward control. Tweet. Now you know how to identify a cluster fly we are going to provide you with some top ways you can identify a housefly. There are actually many many different species of flies that can invade your home for numerous reasons. Adults are gray to black, with four dark, longitudinal lines on the thorax, slightly hairy bodies, and a single pair of membranous wings. Identifying a house fly. The Difference Between Cluster Flies And House Flies Back To Blog. i just killed a fly and its a pretty big one.But this fly is like shiny blue or shiny green and it would buzz and fly alot and would hardly land until it did and i killed it. The housefly (Musca domestica) is a fly of the suborder Cyclorrhapha.It is believed to have evolved in the Cenozoic Era, possibly in the Middle East, and has spread all over the world as a commensal of humans.It is the most common fly species found in houses. Wings– When resting a cluster fly overlaps it wings whereas a housefly’s remain separate. its not the first i have seen either. There are many differences between cluster flies and house flies.