Annual report of the Fruit Growers' Association of Ontario, 1904 . Fig. 18. ^Viouth parts ofa House-fly. Fig. 20. Under surface of Head and Thorax of a Squashbug ; a the odour glands ; h the sucking beak ; c theantenna?. (Original). The respiratory system is clearly shown in Fig. 22. The breathing-pores, or spiracles, are valve-like openings lying along each side, and open al-most directly into a tube which runs lengthwise of the body. From these

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