bean aphid

from WordNet (r) 3.0 (2006)

bean aphid
    n 1: blackish aphid that infests e.g. beans and sugar beets
         [syn: {blackfly}, {bean aphid}, {Aphis fabae}]

from 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]