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The Descent of Man

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the many recorded cases (see, for instance,<br />

Bronn, 'Geschichte der Natur,' B. ii. 1843, s. 164;<br />

and Westwood, 'Transact. Ent. Soc.' vol. iii.<br />

1842, p. 195) <strong>of</strong> distinct species having been<br />

observed in union. Mr. MacLachlan informs me<br />

(vide 'Stett. Ent. Zeitung,' 1867, s. 155) that<br />

when several species <strong>of</strong> Phryganidae, which<br />

present strongly-pronounced differences <strong>of</strong> this<br />

kind, were confined together by Dr. Aug. Meyer,<br />

THEY COUPLED, and one pair produced<br />

fertile ova.), "it is astonishing," as Mr. B.D.<br />

Walsh (3. '<strong>The</strong> Practical Entomologist,' Philadelphia,<br />

vol. ii. May 1867, p 88.) has remarked,<br />

"how many different organs are worked in by<br />

nature for the seemingly insignificant object <strong>of</strong><br />

enabling the male to grasp the female firmly."<br />

<strong>The</strong> mandibles or jaws are sometimes used for<br />

this purpose; thus the male Corydalis cornutus<br />

(a neuropterous insect in some degree allied to<br />

the Dragon flies, etc.) has immense curved<br />

jaws, many times longer than those <strong>of</strong> the female;<br />

and they are smooth instead <strong>of</strong> being toot-

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