| any of the minute, black gnats of the dipterous family Simuliidae, having aquatic larvae. |
| black fly n. Any of various small, dark-colored biting flies of the family Simuliidae, the larvae of which attach to rocks in running streams. Also called buffalo gnat. |
| buffalo gnat n. See black fly. |
black fly n.
Any of various small dark humpbacked flies of whom the females are aggressive biters and serve as vectors in the transmission of onchocerciasis.