Yellow flies are in the same family as mosquitoes, but I find them actually quite a bit more bothersome. They’re strong fliers and voracious hunters, which makes them -very- tough to deal with without professional help.
Adult yellow flies are predominantly yellowish in color and about 1 – 1.2 cm long. The front pair of legs are black in color while the other pairs are yellowish–gray. The wings are clear with black stigma and brown or tan patches near the apex of wing, and this is the thing that helps them to distinguish from deer flies, which have these brown or tan patches across the middle of wings.
Yellow flies like a warm and humid environment.
These flies remain most active during the afternoon time. As far as geographical distribution is considered, these flies are present in the parts of south-eastern U.S. from New Jersey to Texas; Bahamas; Mexico to Costa Rica.
Yellow flies prefer to stay in the areas that are shady and fairly moist; like around edges of forests near rivers or creeks. They usually avoid open sunny areas. Yellow flies are famous for their painful and itchy bites. Females have biting behavior they need to obtain a blood meal before laying eggs.
This blood meal helps them to get adequate protein in for the egg development process.
Outside of just living somewhere, they don’t come around, you can try the ball trap.
You can take a a black beach ball and coat with Tangle-Trap. The yellow flies are attracted to the heat and motion. Tie it to a string and let it blow in the wind, and you should have a good amount of them stuck in no time.