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The ventral piece of the middle segment of the thorax in insects.

Of or pertaining to the mesothorax.

The ventral plate of the third or last segment of the thorax of insects.

Of or pertaining to the metathorax.

A special plate situated on the sides of the mesothorax and metathorax of certain insects.

l beetle of the genus Byrrhus, having a rounded body, with the head concealed beneath the thorax. -- Pill bug (Zoöl.), any terrestrial isopod of the genus Armadillo, having the habit of rolling itself into a ball when disturbed. Called also pill wood louse.

he smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane.

Of or pertaining to the pleura or pleuræ, or to the sides of the thorax.

Any one of the gills of a crustacean that is attached to the side of the thorax.

An instrument for recording the movements of the thorax or chest wall during respiration; -- also called stethograph.

That part of a crustacean behind the cephalothorax; -- more commonly called abdomen.

The dorsal plate of the prothorax in insects. See Illust. of Coleoptera.

An internal dorsal chitinous process between the first two divisions of the thorax of insects.

The segment which forms the posterior part of the thorax of a hymenopterous insect. [Written also propodeum.]

The anterior of the body of an animal, as of a cephalopod; the thorax of an arthropod.

The ventral plate of the prothorax of an insect.

Of or pertaining to the prothorax.

the curved bones attached to the vertebral column and supporting the lateral walls of the thorax.

nsect. It follows the scutum, and is followed by the small postscutellum; a scutella. See Thorax.

ect. It is preceded by the prescutum and followed by the scutellum. See the Illust. under Thorax.