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The Descent of Man

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[Fig.26. Hind-leg <strong>of</strong> Geotrupes stercorarius<br />

(from Landois). r. Rasp. c. Coxa. f. Femur. t.<br />

Tibia. tr. Tarsi.]<br />

<strong>Man</strong>y Lamellicorns have the power <strong>of</strong> stridulating,<br />

and the organs differ greatly in position.<br />

Some species stridulate very loudly, so that<br />

when Mr. F. Smith caught a Trox sabulosus, a<br />

gamekeeper, who stood by, thought he had<br />

caught a mouse; but I failed to discover the<br />

proper organs in this beetle. In Geotrupes and<br />

Typhoeus, a narrow ridge runs obliquely across<br />

(r, Fig. 26) the coxa <strong>of</strong> each hind-leg (having in<br />

G. stercorarius 84 ribs), which is scraped by a<br />

specially projecting part <strong>of</strong> one <strong>of</strong> the abdominal<br />

segments. In the nearly allied Copris lunaris,<br />

an excessively narrow fine rasp runs along<br />

the sutural margin <strong>of</strong> the elytra, with another<br />

short rasp near the basal outer margin; but in<br />

some other Coprini the rasp is seated, according<br />

to Leconte (78. I am indebted to Mr.<br />

Walsh, <strong>of</strong> Illinois, for having sent me extracts

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