. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings -- Origin. Chap. X. Orthoptera. 283 of the Locustidse is so loud that it can be heard during the night at the distance of a mile;27 and that made by certain species is not unmusical even to the human ear, so that the Indians on the Amazons keep them in wicker cages. All observers agree that the sounds serve either to call or excite the mute females. With respect to the migratory locusts of Russia, Korte has given28 an interesting case of selection by the female of a male. The males of t
. The descent of man, and selection in relation to sex. Evolution; Natural selection; Heredity; Human beings -- Origin. Chap. X. Orthoptera. 283 of the Locustidse is so loud that it can be heard during the night at the distance of a mile;27 and that made by certain species is not unmusical even to the human ear, so that the Indians on the Amazons keep them in wicker cages. All observers agree that the sounds serve either to call or excite the mute females. With respect to the migratory locusts of Russia, Korte has given28 an interesting case of selection by the female of a male. The males of this species (Puchytylus miyratorius) whilst coupled with the female stridulate from anger or jealousy, if approached by other males. The house-cricket when surprised at night uses its voice to warn its In North America the Katy-did (Platy- phyllum concavum, one of the Locustidae) is described20 as mount- ing on the upper branches of a tree, and in the evening beginning " his noisy babble, while rival notes issue from the neighbouring " trees, and the groves resound with the call of Eaty-did-she-did " the live-long ; Mr. Bates, in speaking of the Euro- pean "field-cricket (one of the Achetidse), says, " the male has " been observed to place him- " self in the evening at the " entrance of his burrow, and " stridulate until a female ap- " proaches, when the louder " notes are succeeded by a " more subdued tone, whilst " the successful musician ca- " resses with his antennse the " mate he has ;31 Dr. Scudder was able to excite one of these insects to answer him, by rubbing on a file with a In both sexes a re- markable auditory apparatus has been discovered by Von Siebold, situated in the front Fig. 11 Gryllus campestris (from Landois) Right-hand figure, under side of part of 1 wing-nervure, much magnified, showing the teeth, st. Left-hand figure, upper surface
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