|[Note Guidelines] Photographer's Note|
|The adults are 8–12 mm long. Their thorax is gray, with four longitudinal dark lines on the back. The whole body is covered with hair-like projections. The females are slightly larger than the males, and have a much larger space between their red compound eyes. The mass of pupae can range from about 8 to 20 mg under different conditions.|
Like other Diptera (meaning "two-winged"), houseflies have only one pair of wings; the hind pair is reduced to small halteres that aid in flight stability. Characteristically, the media vein (M1+2 or fourth long vein of the wing) shows a sharp upward bend.
Species that appear similar to the housefly include:
The lesser house fly, Fannia canicularis, is somewhat smaller, more slender, and the media vein is straight.
The stable fly, Stomoxys calcitrans, has piercing mouthparts and the media vein is only slightly curved.Info Wikipedia
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