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The Descent of Man

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found her united with a male, and on one occasion<br />

surrounded by several males. Finally, it is<br />

probable that the two sexes <strong>of</strong> many kinds <strong>of</strong><br />

beetles were at first enabled to find each other<br />

by the slight shuffling noise produced by the<br />

rubbing together <strong>of</strong> the adjoining hard parts <strong>of</strong><br />

their bodies; and that as those males or females<br />

which made the greatest noise succeeded best<br />

in finding partners, rugosities on various parts<br />

<strong>of</strong> their bodies were gradually developed by<br />

means <strong>of</strong> sexual selection into true stridulating<br />

organs.<br />

CHAPTER XI.<br />

INSECTS, continued.<br />

ORDER LEPIDOPTERA. (BUTTERFLIES<br />

AND MOTHS.)<br />

Courtship <strong>of</strong> butterflies—Battles—Ticking noise—Colours<br />

common to both sexes, or more

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