The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . After Carpenter, Ptoc. R. Dublin Sac,vol. vui. Fig. 5.—A reef-hauntinghemipteron (Hermatobateshaddonii) with excessively re-duced abdomen. Magnified. Fig. 6.—Water-scorpion (Nepa cinerea) with raptorialfore-legs, heteropterous wings,and long siphon for conveyingair to spiracles. Somewhatmagnified, sc, scutellum; co,cl, m, corium, clavus andmembrane of forewing. the Pentatottfidae, bristle-bearing tubercles on the legs arescraped across a set of fine striations on the abdominal Halobates
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . After Carpenter, Ptoc. R. Dublin Sac,vol. vui. Fig. 5.—A reef-hauntinghemipteron (Hermatobateshaddonii) with excessively re-duced abdomen. Magnified. Fig. 6.—Water-scorpion (Nepa cinerea) with raptorialfore-legs, heteropterous wings,and long siphon for conveyingair to spiracles. Somewhatmagnified, sc, scutellum; co,cl, m, corium, clavus andmembrane of forewing. the Pentatottfidae, bristle-bearing tubercles on the legs arescraped across a set of fine striations on the abdominal Halobates a comb-like series of sharp spines on the fore-shincan be drawn across a set of blunt processes on the shin of theopposite leg. Males of the little water-bugs of the genus Corixamake a shrill chirping note by drawing a row of teeth on theflattened fore-foot across a group of spines on the haunch ofthe opposite leg. But the loudest and most remarkable vocalorgans of all insects are those of the male cicads, which sing. d e From MarUtt, Bull. 14 () Div. Enl. Dept. Agr. Fig. 7. o, Body of male Cicad from c, Section showing muscles whichbelow, showing cover-plates vibrate drum (magnified); of musical organs; d, A drum at rest; b, From above showing drums, e, Thrown into vibration, morenatural size; highly magnified. by the rapid vibration of a pair of drums or membraneswithin the These drums are worked by specialmuscles, and the cavities in which they lie are protected byconspicuous plates visible beneath the base of the abdomen(see fig. 7), Fossil History.—The Heteroptera can be traced back fartherthan any other winged insects if the fossil Prolocimtx siluricaMoberg, from the Ordovician slates of Sweden is rightly regardedas the vsing of a bug. But according to the recent researchesof A. Handlirsch it is not insectan at all. Both Heteropterousand Homopterous genera have been described from the Carbon-iferous, but the true nature of some of these is dou
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectencyclo, bookyear1910
