Economic entomology for the farmer Economic entomology for the farmer and fruit-grower economicentomolo01smit Year: 1906 Tracheal gills.—a, leaf-like anal plate oi Agrion . b, thread-like tuft of Corydalus ; c, plate-like gill of Ephemera. Air-bladder at end of tracheal tube in Bom- bus.

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