. Rundschreiben. Insekten und Schädlinge. 18 Zinn}^Ei. Dieses Ei schlüpft in eine hirva in wenigen Tone, und das wie gewohnt in den Körper des "grünen Bug" des hirva bis zu der Zeit, die es voll wird - groAA'n ist in Abb. 1 gezeigt. G, Seite 4. Bis zu tliis Zeit innerhalb des Körpers der "grünen Bug" ohne die lebenswichtige Teile erreichen versorgt hat, aber das Verhindern zu einem mehr oder weniger von der Geburt bis zum Jungen. Dies ist eine wichtige Tatsache, denn, wie der Parasit scheint es bevorzugen teilweise Jungen gewachsen, es beginnt der Anstieg der Pest vor dem Tod des "grünen Fehler zu prüfen.

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. Circular. Insect pests; Insect pests. 18 tin}^ egg. This egg hatches into a hirva in a few clays, and the usual position in the body of the "green bug" of the hirva up to the time it becomes full-groAA'n is shown in fig. G, page 4. Up to tliis time it has fed within the body of the " green bug" without reaching any of the vital parts, but preventing to a greater or less degree the giving of birth to young. This is an important fact, for, as the parasite seems to prefer partly grown young, it begins to check the increase of the pest before the death of the " green bug " takes place. Mr. Phillips has found that females parasitized at this period of their development do not reproduce for more than a very few days. After about six daj^s the larva of the parasite reaches full growth and becomes more active, working its way about within the still living body of its host, which now dies a seemingly terrible death. The motions of the parasitic larva within cause the skin of the " green bug " to become rotund in shape, as shown in fig. 9; the skin also becomes darker and hardens. Within four days (the life cycle in warm weather occupying about ten days) the adult Lysiphlebus emerges through a round hole in the dried skin of the " green bug, " as shown also in fiig. 0. In fields that have been destroyed the leaves become almost covered by their brown bodies, as shown in fig. 7. As stated, many of the " green bugs " are stung by the Lysiphlebus while quite 3'Oung, and if these develop to winged adults, as they do at times in myriads and drift away to distant fields, they carry the parasite with them in their bodies. One of these parasitized winged females is shown in fig. 10. The very act of migration of the " green bug, " therefore, brings the parasite, and there is no need of artificial introduction, for if the center from which the " green bug " is migrating has the para- sites, as it always doe

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