Archive image from page 287 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 274 THE DESCENT OF MAN. beetles) a few of the middle joints of the antennae are dilated and furnished on the inferior surface with cushions of hair, exactly like those on the tarsi of the Car- abidaB, 'and obviously for the same end.' In male dragon-flies, 'the 'appendages at the tip of the tail 'are modified in an almost infinite 'variety of curious patterns to en- 'able them to embrace the neck of 'the female.' Lastly, in the males of many insects, the le
Archive image from page 287 of The descent of man . The descent of man : and selection in relation to sex descentofmanseledarw Year: 1874 274 THE DESCENT OF MAN. beetles) a few of the middle joints of the antennae are dilated and furnished on the inferior surface with cushions of hair, exactly like those on the tarsi of the Car- abidaB, 'and obviously for the same end.' In male dragon-flies, 'the 'appendages at the tip of the tail 'are modified in an almost infinite 'variety of curious patterns to en- 'able them to embrace the neck of 'the female.' Lastly, in the males of many insects, the legs are fur- nished with peculiar spines, knobs or spurs; or the whole leg is bowed or thickened, but this is by no means invariably a sexual charac- ter; or one pair, or all three pairs are elongated, sometimes to an ex- travagant length. The sexes of many species in all the orders present differences, of which th meaning is not under- stood. One curious case is that of a beetle (fig. 10), the male of which has the left mandible much en- larged; so that the mouth is greatly distorted. In another Carabidous beetle, Eurygnathus, we have the case, unique as far as known to Mr. Wollaston, of the head of the female being much broader and larger, though in a variable de- gree, than that of the male. Any number of such cases could be given. They abound in the Lepidoptera: one of the most extra- ordinary is that certain male butterflies have their fore-legs more or less atrophied, with the tibiae and tarsi reduced to mere rudi- mentary knobs. The wings, also, in the two sexes often differ in neuration,' and sometimes considerably in outline, as in the Aricoris epitus, which v/as shown to me in the British Museum by Mr. A. Butler. The males of certain South American butter- flies have tufts of hair on the margins of the wings, and horny Fig. 9. Crabro cribrarius. Up- per figure, male; lower fig- ure, female. about Penthe, and others in inverted commas, are taken from Mr. Walsh, 'Prac
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