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Here is a brief description of what the yellow fly looks like. Yellow Flies are a nuisance fly. Can cause very bad swelling and allergic reaction and requiring in some cases medical assistance.

Deer Flies are bloodsucking insects considered a pest to humans and cattle. They are large flies with large brightly colored compound eyes, and large clear wings with dark bands. They are larger than the common housefly and smaller than the horsefly. There are 250 species of deer fly in the genus Chrysops. 

 Stomoxys calcitrans is commonly called the stable fly, barn fly, biting house fly, dog fly, or power mower fly. Unlike most members of the family Muscidae, Stomoxys calcitrans and others of its genus suck blood from mammals.  

 Horseflies are true flies in the family Tabanidae in the insect order Diptera. They are often large and agile in flight, and only the female horseflies bite animals, including humans, to obtain blood. They prefer to fly in sunlight, avoiding dark and shady areas, and are inactive at night.