negro fly
Webster's Dictionary (GCIDE)
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]