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  • Yellow-Fly - (Diachlorus ferrugatus)

    Yellow-Fly - (Diachlorus ferrugatus)

    The bites of the female Yellow Fly are both annoying and painful. They attack at will and usually with friends.

    Picture of Yellow-Fly
    Staff Writer (8/28/2014): Sometimes mistaken for a Deer Fly, Yellow Flies are just as unwelcome by both humans and animals. The female attacks exposed flesh for a quick blood meal. Males do not bite. Heads and ears are easy targets on humans. Faces, backs and legs are often targets on animals such as horses and livestock. They will use their tails to swat and kill the Yellow Fly since repeat attacks are the norm. The bites are painful, becoming red and irritated over the next day or two, often ending in an allergic reaction that leads to painful blisters. Humans can use insect repellents with DEET to deter them. Fly traps in stables and barns are said to reduce their numbers in those areas.

    Both genders will drink flower nectar and eat pollen, but females add to their diet by consuming blood from animals. She will lay 50 or so fertilized eggs in a muddy area, near a lake, creek, pond or stream. Larvae (maggots) hatch and will molt several times before taking on a winged adult form. They feed on decaying matter and spend some time feeding on debris in water before migrating to land.

    The most active months for biting attacks are May and June in the south. They are most active between afternoon and dusk. Large congregations live near water, which is necessary for part of the larval life stage. They can be found bothering people and animals in backyards, open fields, parks, farms and forest edges near water.

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    Details of the:

    Category: Fly or Mosquito
    Common name: Yellow-Fly
    Scientific Name: Diachlorus ferrugatus

      Kingdom: Animalia
       Phylum: Arthropoda
        Class: Insecta
         Order: Diptera
          Family: Tabanidae
           Genus: Diachlorus
            Species: ferrugatus

    Size (Adult, Length): 8mm to 10mm (0.31in to 0.39in)

    Identifying Colors: yellow, black, brown, green, blue, purple

    Additional Descriptors: flying, biting, eye bands, green eyes, clusters,

    North American Reach (Though Not Limited To*): Alabama; Delaware; Florida; Georgia; Illinois; Indiana; Kentucky; Louisiana; Maryland; Mississippi; Missouri; New Jersey; New Mexico; New York; North Carolina; Ohio; Pennsylvania; South Carolina; Tennessee; Texas; Virginia; West Virginia; Mexico

    * Keep in mind that an insect's reach is not limited by lines on a map and therefore may appear in areas/regions/states beyond those listed above.

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