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The Descent of Man

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uns away. (70. Quoted from Fischer, in 'Dict.<br />

Class. d'Hist. Nat.' tom. x. p. 324.) <strong>The</strong> two<br />

sexes <strong>of</strong> another Lamellicorn beetle, the Ateuchus<br />

cicatricosus, live in pairs, and seem much<br />

attached to each other; the male excites the females<br />

to roll the balls <strong>of</strong> dung in which the ova<br />

are deposited; and if she is removed, he becomes<br />

much agitated. If the male is removed the<br />

female ceases all work, and as M. Brulerie believes,<br />

would remain on the same spot until she<br />

died. (71. 'Ann. Soc. Entomolog. France,' 1866,<br />

as quoted in 'Journal <strong>of</strong> Travel,' by A. Murray,<br />

1868, p. 135.)<br />

[Fig. 24. Chiasognathus Grantii, reduced. Upper<br />

figure, male; lower figure, female.]<br />

<strong>The</strong> great mandibles <strong>of</strong> the male Lucanidae are<br />

extremely variable both in size and structure,<br />

and in this respect resemble the horns on the<br />

head and thorax <strong>of</strong> many male Lamellicorns<br />

and Staphylinidae. A perfect series can be formed<br />

from the best-provided to the worst-

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