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THE ANATOMY OF INSECTS 33<br />

glands, and other organs, and distributes the beneficial products where needed<br />

while the waste material is given up to the MalpighirlD tubules. It is rather remarkable<br />

that red blood Occur» in the blood gills of certain aquatic insects: the<br />

larvre of a few caddisfiies, midges, buffalo gnats or black flies, beetles, and caterpillars.<br />

RESPIRATORY SYSTEM<br />

The breathing or respiratory system is closed, and its elastic trache

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