. An annotated list of the important North American forest insects. Forest insects. 12 Bulletin 454 two to three days the nymphs molt and transform to the winged adult oviparous females. These females are certainly very inactive, and in the great majority of cases do not move far from the places in which the respective nymphs have cast their skins. The writers have never seen any indications of a migratory movement among these females. One wonders how this insect spreads from one plant to another, for it certainly does do so although the dispersal from a common center is gradual and very slow.
. An annotated list of the important North American forest insects. Forest insects. 12 Bulletin 454 two to three days the nymphs molt and transform to the winged adult oviparous females. These females are certainly very inactive, and in the great majority of cases do not move far from the places in which the respective nymphs have cast their skins. The writers have never seen any indications of a migratory movement among these females. One wonders how this insect spreads from one plant to another, for it certainly does do so although the dispersal from a common center is gradual and very slow. The females settle rather quickly after the body has hardened, and, for the most part, go to the undersides of the branches. In from two to five days each one begins laying its quota of eggs, and the egg-laying continues for about ten days, when the full number, from 40 to 50, have been laid. The female dies when her eggs are all deposited, but her dead body covers the eggs and clings to the leaves long after the young nymphs have settled for the winter. Indeed, the shriveled bodies of the females may be found late in the winter. The eggs, which begin to be deposited during the first week of September, hatch through a period of two weeks, so that some of them do not hatch until the latter part of the month and probably some not until into October. The young nymphs are active, and crawl about over the leaves appar- ently inserting their beaks now and then to feed. By the latter part of October most of the nymphs have migrated from the leaves to the twigs and have settled for the winter. They insert their beaks into the tender bark of the twigs, and many of them secrete waxy threads over their bodies. The nymphs tend to gather in groups mostly near the distal ends of the twigs, where they may be found during the winter. Suiiiniory of life history The insects overwinter as small nymphs of the ovipa- rous, wingless, agamic females ensconced in crevices about the bases of the buds.
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
