. Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; . Tracheal gills.—a, leaf-like anal plate oi -Agrion . b, thread-like tuft of Corydalus; c. olate-like gill of Ephemera. Air-bladder at end of tracheal tube in Bom- bus.

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1906