“The genuine or half-winged Bugs (Figs. 18 and 19) are usually flattened in form, when mature; though more rounded in the adolescent stages. They may be divided into Land Bugs (Aurocorisa) and Water Bugs (Hydrocorisa). The species of the first division very generally possess the power of emitting, when disturbed or alarmed, a nauseous, bed-buggy odor, which comes from a fluid secreted from two pores, situated on 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 injurious to man.
Fig. 20.—A Tree-hopper
(Ceresa bubalus).
a, side; b, top view.
“The Whole-winged Bugs (Figs. 20 and 21), on the contrary, are all plant-feeders, and with the exception 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 characteristic of this section as the nauseous odor is of the first. It forms three natural divisions, arranged according to the number of joints to the tarsi—namely Trimera, with three joints; Dimera, with two joints;, and Monomera, with one joint to the tarsi.”
Fig. 21.—A Plant-louse (Schizoneura lanigera). a, infested
root; b, larva; c, winged insect; d–g, parts of perfect
insect enlarged.
Suborder [Thysanoptera] (ϑυσανος, a fringe; πτερον, wing): This suborder contains the single family Thripidæ, which comprises minute insects commonly known as Thrips, and of which a common species, Thrips striatus, is shown in the accompanying figure. (See [Fig. 22.]) They bear strong relations to both the Pseudoneuroptera and the Hemiptera and by later writers 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 on the back when at rest, and beautifully fringed, from which latter feature the name of the suborder is derived.
Fig. 22.—Thrips striatus, with wings enlarged
at side.