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The Descent of Man

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d'Anat. Comp.' (French translat.), tom. 1, 1850,<br />

p. 567.)<br />

[Fig.11. Gryllus campestris (from Landois).<br />

Right-hand figure, under side <strong>of</strong> part <strong>of</strong> a wingnervure,<br />

much magnified,<br />

showing the teeth, st.<br />

Left-hand figure, upper surface <strong>of</strong> wing-cover,<br />

with the projecting, smooth<br />

nervure, r, across which the teeth (st) are scraped.<br />

Fig.12. Teeth <strong>of</strong> Nervure <strong>of</strong> Gryllus domesticus<br />

(from Landois).]<br />

In the three Families the sounds are differently<br />

produced. In the males <strong>of</strong> the Achetidae both<br />

wing-covers have the same apparatus; and this<br />

in the field-cricket (see Gryllus campestris, Fig.<br />

11) consists, as described by Landois (34.<br />

'Zeitschrift fur wissenschaft. Zoolog.' B. xvii.<br />

1867, s. 117.), <strong>of</strong> from 131 to 138 sharp, transverse<br />

ridges or teeth (st) on the under side <strong>of</strong>

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