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The Descent of Man

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ger than the females. <strong>The</strong> explanation <strong>of</strong> this<br />

anomaly is that a marriage flight is absolutely<br />

necessary with these species, and the male requires<br />

great strength and size in order to carry<br />

the female through the air. Increased size has<br />

here been acquired in opposition to the usual<br />

relation between size and the period <strong>of</strong> development,<br />

for the males, though larger, emerge<br />

before the smaller females.<br />

We will now review the several Orders, selecting<br />

such facts as more particularly concern us.<br />

<strong>The</strong> Lepidoptera (Butterflies and Moths) will be<br />

retained for a separate chapter.<br />

ORDER, THYSANURA.<br />

<strong>The</strong> members <strong>of</strong> this lowly organised order are<br />

wingless, dull-coloured, minute insects, with<br />

ugly, almost misshapen heads and bodies.<br />

<strong>The</strong>ir sexes do not differ, but they are interesting<br />

as shewing us that the males pay sedulous<br />

court to the females even low down in the ani-

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