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A genus of small dipterous files, including several very injurious species, as the Hessian fly. See Hessian fly.

an crucible. See under Crucible. -- Hessian fly (Zoöl.), a small dipterous fly or midge (Cecidomyia destructor). Its larvæ live between the base of the lower leaves and the stalk of wheat, and are very destructive to young wheat; -- so called from the erroneous idea that it was brought into America by the Hessian troo…

(Zoöl.), a conical, scaly gall produced on willows by the larva of a small dipterous fly (Cecidomyia strobiloides). -- Willow grouse (Zoöl.), the white ptarmigan. See ptarmigan. -- Willow lark (Zoöl.), the sedge warbler. [Prov. Eng.] -- Willow ptarmigan (Zoöl.) (a) The European reed bunting, or black-headed bunting.…