black fly

Noun

Meaning

small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals

Source: WordNet

buffalo gnat midge gnat aphid punky mosquito hawk blackfly no-see-um punkie biting midge bee fly mud dauber flesh fly greenbottle biting gnat

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gnat

If you are bitten by a large fly, it is most likely a horse fly, deer fly, stable fly, or black fly. Source: Internet

Marcus humors him by saying that it is a black fly like Aaron. Source: Internet