wheat-fly

from The Century Dictionary.

• noun Any one of several flies of the family Oscinidæ, common upon wheat in Europe and North America, as Oscinis frit, Chlorops tæniopus, and C. lineata.
• noun The Hessian fly.
• noun The wheat-midge.
• noun Improperly, a wheat plant-louse in the winged form.
• noun The wheat gall-fly, a variety of Isosoma hordei, whose larva is the wheat joint-worm. See joint-worm, 2.