House flies are usually gray in appearance and display four black stripes on their thorax. Adult house flies are about 1/8-1/4” (4 to 7.5 mm) long. They have slightly hairy bodies, a single pair of wings and compound red eyes, which contain thousands of individual lenses that allow them to have wider vision. Female house flies are usually larger than males. House flies do not have teeth or a stinger.
House fly eggs resemble small grains of rice. The eggs hatch into larvae, also known as maggots, which range in size from about ¼-3/8” (7-10 mm) long. Maggots are cream colored with a greasy appearance. When entering the pupal stage, maggots develop dark, hard outer shells, legs and wings, ultimately emerging as full-grown adult flies.