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The Descent of Man

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tood— Difference in size between the sexes—<br />

Thysanura—Diptera—Hemiptera— Homoptera,<br />

musical powers possessed by the males alone—Orthoptera,<br />

musical instruments <strong>of</strong> the<br />

males, much diversified in structure; pugnacity;<br />

colours—Neuroptera, sexual differences in colour—Hymenoptera,<br />

pugnacity and odours—<br />

Coleoptera, colours; furnished with great<br />

horns, apparently as an ornament; battles, stridulating<br />

organs generally common to both<br />

sexes.<br />

In the immense class <strong>of</strong> insects the sexes sometimes<br />

differ in their locomotive-organs, and<br />

<strong>of</strong>ten in their sense-organs, as in the pectinated<br />

and beautifully plumose antennae <strong>of</strong> the males<br />

<strong>of</strong> many species. In Chloeon, one <strong>of</strong> the Ephemerae,<br />

the male has great pillared eyes, <strong>of</strong><br />

which the female is entirely destitute. (1. Sir J.<br />

Lubbock, 'Transact. Linnean Soc.' vol. xxv,<br />

1866, p. 484. With respect to the Mutillidae see<br />

Westwood, 'Modern Class. <strong>of</strong> Insects,' vol. ii. p.

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