Appearance
H. irritans is the smallest of the biting muscids, gray in color, approximately 3⁄16 in (4.0 mm) in length. Both the male and female have slender, black, piercing mouthparts which project forward from the bottom of the head. They often aggregate densely on cattle, each fly oriented with its head in the same direction as hair tips of that site on the host. Horn flies typically have eyes that are dark reddish-brown.
Read more about this topic: Haematobia Irritans
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