. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CRAP. JL} ORTHOPTERA. 301 birds, they are excited or allured by the male with the most attractive voice. I have not heard of any well-marked cases of ornamental differences between the sexes of the Homoptera. Mr. Douglas informs me that there are three British species in which the male is black or marked with black bands, while the females are pale-colored or obscure. Order, Orthoptera (Crickets and Grasshoppers).—The males in the three saltatorial families in this Order are remarkable
. The descent of man, and selection in relation to sex. Evolution; Heredity; Human beings; Natural selection. CRAP. JL} ORTHOPTERA. 301 birds, they are excited or allured by the male with the most attractive voice. I have not heard of any well-marked cases of ornamental differences between the sexes of the Homoptera. Mr. Douglas informs me that there are three British species in which the male is black or marked with black bands, while the females are pale-colored or obscure. Order, Orthoptera (Crickets and Grasshoppers).—The males in the three saltatorial families in this Order are remarkable for their musical powers, namely, the Achetidae, or crickets, the Locustidae, for which there is no equivalent English name, and the Acridiidae, or grasshoppers. The stridulation produced by some of the Locustidae is so loud that it can be heard dur- ing the night at the distance of a mile; ^^ and that made by certain species is not un- musical 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, Korter has given^ an Fig. n.—Oniius campestris (from Lan- inft^rfKjHncr c^^e- nf cplprHnn **°'^^- Right-hand figure, under side of part of iiikv^iv^oLiiig *^cu5t Kj\. ocic^^LUjii ^ Wing ncrvure, much magmneu, showing the by the female of a male, '^.^^h, st. Left-hand figure, upper surface of _/, - r L • • wmg-cover, with the projecting, smooth nerv- ihe males of this species , across which the teeth (j/) are scraped. {Pachytylus migratorius) while coupled with the female stridulate from anger or jealousy if approached by other males. The house-cricket when sur- prised at night uses its voice to warn its fellows.^^ In North America the Katy-did {Platyphyllum concavu?n, one of the Lo- custidae) is described^ as mounting on the upper branches of a ti'ee, and in the evening beginning ** his nodsy babble, while r
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthumanbeings, bookyear
