carrot fly

from The Collaborative International Dictionary of English v.0.48

Negro \Ne"gro\, a.
   Of or pertaining to negroes; black.
   [1913 Webster]

   {Negro bug} (Zool.), a minute black bug common on the
      raspberry and blackberry. It produces a very disagreeable
      flavor.

   {negro corn}, the Indian millet or durra; -- so called in the
      West Indies. See {Durra}. --McElrath.

   {Negro fly} (Zool.), a black dipterous fly ({Psila rosae})
      which, in the larval state, is injurious to carrots; --
      called also {carrot fly}.

   {Negro head} (Com.), Cavendish tobacco. [Cant] --McElrath.

   {Negro monkey} (Zool.), the {moor monkey}.
      [1913 Webster]