Source: The Collaborative International Dictionary of English v.0.48
black fly \black fly\, blackfly \blackfly\, (Zool.)
1. In the United States, a small, venomous, two-winged fly of
the genus Simulium of several species, exceedingly
abundant and troublesome in the northern forests; --
called also buffalo gnat. The larv[ae] are aquatic. It
sucks the blood of birds as well as humans and other
mammals.
[WordNet 1.5 + WordNet 1.5]
2. A black plant louse, as the bean aphis (Aphis fab[ae]),
which infests e. g. beans and sugar beets; -- called also
bean aphid.
[WordNet 1.5]
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