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soiiri were invaded b}^ the army of 1867; and, as I have shown in the 

 Practical Entomologist, the southern parts of Nebraska were very 

 generally invaded by the, army of 1866. This second invading 

 army, however, does not seem to have been quite as numerous as that 

 of the preceding year. 



It has been erroneously supposed by many, that this swarm of 

 winged Grasshoppers, which made its appearance in Kansas, Ne- 

 braska and Iowa from August 25th to September 30th, 1867, was 

 not a fresh importation from the Eocky Mountains, but simply the 

 individuals that hatched out in the spring of 1867 from the eggs laid 

 in the autumn of 1866 by the invading army of that year. But, in 

 the first place, as I have already shown, there was an interval of, at 

 the very least, 42 days, during which no ravages by Grasshoppers are 

 recorded anywhere in the afflicted region — which pretty effectually 

 demolishes the abo\e supposition; secondly, one of the reports printed 

 beloAv expressly says that, for a period of 2^ days,there was a constant 

 influx of Grasshoppers into Eichland, Nebraska, from the north- 

 west; and thirdly, although south-western Iowa was really invaded 

 in 1867 by some of the unfledged Grasshoppers from Missouri, yet this 

 took place, not in the autumn, but early in June as the following para- 

 graph shows: — 



"The Grasshoppers are making sad ravages upon the crops of 

 south-western Iowa. Whole fields of grain disappear in a single 

 night. They go in large droves, and keep straight onward, no im- 

 pediment whatever turning them from their course.'' — Roch Island 

 {III.) Union, June 17, 1867. 



Now, if the swarms that invaded Iowa in September sprang from 

 the same source as those that invaded that State in June, why do we 

 hear nothing of any Grasshoppers there from the forepart of June 

 to the latter end of August? The truth of the matter seems to be, 

 that the Hateful Grasshopper, in its native alpine home in the Kocky 

 Mountains, attains maturity in August, and then, according to the 

 mysterious promptings of its peculiar instinct, often takes wing for 

 the far-distant lowlands towards the East; while the very same spe- 

 cies, when hatched out in warmer climates, that is, in the lowlands 

 of the Mississippi Valley, attains maturity towards the end of June, 

 or fully one month earlier, and then, prompted by the same instinct 

 that governed it in its native home, immediately takes wing, and 

 usually flies off in a south-east direction; after which it perishes in 

 some unknown manner. 



"De Soto, Nebraska, Aug. 29, 1867. — Invasion of Grasshoppers, 



