House flies have one pair of membranous wings and their hind wings are modified as halteres ( club shaped balancing organs). They have sucking mouthparts which can be either piercing or non-piercing, large compound eyes and tarsi (segmented sections like feet on the ends of their legs).The common housefly adults are 6-8mm long with a wingspan of 13-15mm, a grey thorax (the part of the body between the head and abdomen) with four longitudinal dark stripes.
The lesser housefly adult is 6mm long with a 12mm wingspan, a grey thorax and three longitudinal stripes which are less pronounced than those of the common housefly.
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