\A"phis\, n.; pl. {Aphides}. [NL.] (Zo["o]l.)
A genus of insects belonging to the order Hemiptera and
family {Aphid[ae]}, including numerous species known as plant
lice and green flies.
Note: Besides the true males and females, there is a race of
      wingless asexual individuals which have the power of
      producing living young in rapid succession, and these
      in turn may produce others of the same kind for several
      generations, before sexual individuals appear. They
      suck the sap of plants by means of a tubular proboscis,
      and owing to the wonderful rapidity of their
      reproduction become very destructive to vegetation.
      Many of the {Aphid[ae]} excrete honeydew from two tubes
      near the end of the body.