An illustrated account of the thoracic mechanism of the milkweed bug, Oncopeltus fasciatus (Dallas), is given. The thoracic skeleton including legs and wings is described and this is followed by a discussion of the interaction of these parts with the musculature. The action of the extrinsic and intrinsic leg muscles, being well known, is tabled as are also the origins and insertions of all the thoracic muscles.
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Govind et al. (1970) studied this question.
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