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blackfly

Noun

black=fly

WORDNET DICTIONARY

blackfly(n = noun.animal) aphis fabae, bean aphid - blackish aphid that infests e.g. beans and sugar beets; Array

is a kind of aphid

is a member of aphis, genus aphis

blackfly(n = noun.animal) black fly, buffalo gnat - small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals; Array

is a kind of gnat

is a member of genus simulium, simulium

blackfly,

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 larvæ are aquatic. It sucks the blood of birds as well as humans and other mammals. [WordNet 1.5]
A black plant louse, as the bean aphis (Aphis fabæ), which infests e. g. beans and sugar beets; -- called also bean aphid. [WordNet 1.5]

blackfly, n. (pl. -flies) any of various thrips or aphids, esp. Aphis fabae, infesting plants.

For further exploring for "blackfly" in Webster Dictionary Online