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From The Collaborative International Dictionary of English v.0.48:
Oscinian \Os*cin"i*an\, n. (Zool.) Any one of numerous species of dipterous flies of the family Oscinidae. [1913 Webster] Note: Some, whose larvae live in the stalks, are very destructive to barley, wheat, and rye; others, as the barley fly (Oscinis frit), destroy the heads of grain. [1913 Webster]