. Bulletin - United States National Museum. Science. 6 Fig. 20.—a Tree-hop- per (Ceresa hubalus). a, side; 6, top from two pores, situated ou the under side of the metathorax. Such well-known insects as the Bed-bug and Chinch-bug belong- here. The habits of the species are varied, and while some are beneficial, others are quite injuri- ous to man. "The Whole-winged Bugs ( and 21), on the contrary, are all plant-feeders, and with the excep- tion of a few, such as the Cochineal and Lac insects, are injurious. The secretion of a white, or bluish, waxy, or farinose substance fro
. Bulletin - United States National Museum. Science. 6 Fig. 20.—a Tree-hop- per (Ceresa hubalus). a, side; 6, top from two pores, situated ou the under side of the metathorax. Such well-known insects as the Bed-bug and Chinch-bug belong- here. The habits of the species are varied, and while some are beneficial, others are quite injuri- ous to man. "The Whole-winged Bugs ( and 21), on the contrary, are all plant-feeders, and with the excep- tion of a few, such as the Cochineal and Lac insects, are injurious. The secretion of a white, or bluish, waxy, or farinose substance from the surface of the body is as charac- teristic of this section as the nauseous odor is of the first. It forms three natural divi- sions, arranged according to the number of joints to the tarsi—namely Trimera, with three joints; DimeeA, with two joints, and Monomera, with one joint to the ; Suborder Thysanoptera -^ ^-^s:^- {duqavoq^ a fringe; itrepuv^ TV wmg): This suborder con- ^ ^^Xt^ tains the single family Thri- ^ ^ . Fis. 21.—A Plant-louse ((ScHxoweitraZcMiig'era). a, infested J)t^tfe, which comprises minute root; ^ larva; c, ringed insect; d-(j, parts of perfect insects commonly known as insect enlarged. Thrips, and of which a common species, Tlirips striatiis, is shown in the accompanying figure. (See Fig. 22.) They bear strong relations to both the Pseudoneuroptera and the Hemiptera and by later writ- ers are generally associated with the latter order. They feed on plants, puncturing and killing the leaves, or on other plant-feeding species of their own class, and are characterized by having narrow wings crossed ou the back when at rest, and beautifully fringed, from which lat- ter feature the name of the suborder is derived. The month parts are peculiar in that they are intermediate in form between the sucking beak of He- miptera and the biting mouth parts of other insects. Their eggs resemble those of Hemiptera; the larvse and pupae are active, and i
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
