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They might be thought to be adapted for fighting, but as in one species they are of a beautiful pink colour, edged with black, with a pale central stripe, and as these insects have altogether a very elegant appearance, it is perhaps more probable that they serve as ornaments. That the males of some Diptera fight together is certain; Prof. Westwood*(2) has several times seen this with the Tipulae. The males of other Diptera apparently try to win the females by their music: H. Muller*(3) watched for some time two males of an Eristalis courting a female; they hovered above her, and flew from side to side, making a high humming noise at the same time. Gnats and mosquitoes (Culicidae) also seem to attract each other by humming; and Prof. Mayer has recently ascertained that the hairs on the antennae of the male vibrate in unison with the notes of a tuning-fork, within the range of the sounds emitted by the female. The longer hairs vibrate sympathetically with the graver notes, and the shorter hairs with the higher ones. Landois also asserts that he has repeatedly drawn down a whole swarm of gnats by uttering a particular note. It may be added that the mental faculties of the Diptera are probably higher than in most other insects, in accordance with their highly-developed nervous System.*(4) * The Malay Archipelago, vol. ii., 1869, p. 313. *(2) Modern Classification of Insects, vol. ii., 1840, p. 526. *(3) "Anwendung," c., Verh. d. n. V. Jahrg. xxix. p. 80. Mayer, in American Naturalist, 1874, p. 236. *(4) See Mr. B. T. Lowne's interesting work, On the Anatomy of the Blowfly, Musca vomitoria, 1870, p. 14. He remarks (p. 33) that, "the captured flies utter a peculiar plaintive note, and that this sound causes other flies to disappear." Order: HEMIPTERA (Field-Bugs).- Mr. J. W. Douglas, who has particularly attended to the British species, has kindly given me an account of their sexual differences. The males of some species are furnished with wings, whilst the females are wingless; the sexes differ in the form of their bodies, elytra, antennae and tarsi; but as the signification of these differences is unknown, they may be here passed over. The females are generally larger and more robust than the males. With British, and, as far as Mr. Douglas knows, with exotic species, the sexes do not gasmonly differ much in colour; but in about six British species the male is considerably darker than the female, and in about four other species the female is darker than the male. Both sexes of some species are beautifully coloured; and as these insects emit an extremely nauseous odour, their conspicuous colours may serve as a signal that they are unpalatable to insectivorous animals. In some few cases their colours appear to be directly protective: thus Prof. Hoffmann informs me that he could hardly distinguish a small pink and green species from the buds on the trunks of lime-trees, which this insect frequents. Some species of Reduvidae make a stridulating noise; and, in the case of Pirates stridulus, this is said* to be effected by the movement of the neck within the prothoracic cavity. According to Westring, Reduvius personatus also stridulates. But I have no reason to suppose that this is a sexual character, excepting that with non-social insects there seems to be no use for sound-producing organs, unless it be as a sexual call. * Westwood, Modern Classification of Insects, vol. ii., p. 473. Order: HOMOPTERA.- Every one who has wandered in a tropical forest must have been astonished at the din made by the male Cicadae. The females are mute; as the Grecian poet Xenarchus says, "Happy the cicadas live, since they all have voiceless wives." The noise thus made could be plainly heard on board the Beagle, when anchored at a quarter of a mile from the shore of Brazil; and Captain Hancock says it can be heard at the distance of a mile. The Greeks formerly kept, and the Chinese now keep these insects in cages for the sake of their song, so that it must be pleasing to the ears of some men.* The Cicadidae usually sing during the day, whilst the Fulgoridae appear to be night-songsters. The sound, according to Landois,*(2) is produced by the vibration of the lips of the spiracles, which are set into motion by a current of air emitted from the tracheae; but this view has lately been disputed. Dr. Powell appears to have proved*(3) that it is produced by the vibration of a membrane, set into action by a special muscle. In the living insect, whilst stridulating, this membrane can be seen to vibrate; and in the dead insect the proper sound is heard, if the muscle, when a little dried and hardened, is pulled with the point of a pin. In the female the whole gasplex musical apparatus is present, but is much less developed than in the male, and is never used for producing sound. * These particulars are taken from Westwood's Modern Classification of Insects, vol. ii., 1840, p. 422. See, also, on the Fulgoridae, Kirby and Spence, Introduct., vol. ii., p. 401. *(2) Zeitschrift fur wissenschaft Zoolog., B. xvii., 1867, ss. 152-158. *(3) Transactions of the New Zealand Institute, vol. v., 1873, p. 286. With respect to the object of the music. Dr. Hartman, in speaking of the Cicada septemdecim of the United States, says,* "The drums are now (June 6th and 7th, 1851) heard in all directions. This I believe to be the martial summons from the males. Standing in thick chestnut sprouts about as high as my head, where hundreds were around me, I observed the females gasing around the drumming males." He adds, "This season (Aug. 1868) a dwarf pear tree in my garden produced about fifty larvae of C. pruinosa; and I several times noticed the females to alight near a male while he was uttering his clanging notes." Fritz Muller writes to me from S. Brazil that he has often listened to a musical contest between two or three males of a species with a particularly loud voice, seated at a considerable distance from each other: as soon as one had finished his song, another immediately begun, and then another. As there is so much rivalry between the males, it is probable that the females not only find them by their sounds, but that, like female birds, they are excited or allured by the male with the most attractive voice. * I am indebted to Mr. Walsh for having sent me this extract from A Journal of the Doings of Cicada septemdecim, by Dr. Hartman. 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, whilst the females are pale-coloured or obscure. Order: ORTHOPTERA (Crickets and Grasshoppers).- The males in the three saltatorial families in this Order are remarkable for their musical powers, na hongyangword1hongyangword2hongyanggroupcopyright
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