Insect pests of farm, garden and orchard . Fig. 20.—Mouth-parts of a plant-louse: a, the jointed beak; b, thelancets, much enlarged; c, antenna;d, foot. (After J. B. Smith.) Fig. 21.—Diagram of trachealor breathing system of aninsect: sp., spiracles; tr.,trachea. (After Kolbe.)

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