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7 4 2 
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Ps Py Ce tk ad Re Ei Rat oer 
53 
ing in many places. There has been an astonishing exodus from these 
regions of settlers who must be convinced by painful experience that 
the promises of spring are liable to give way to desert-like dryness in 
summer. It is, of course, well understood that the absence of serious 
damage since 1876 has been partially due to the settling up of the 
valleys in the permanent region. The abandoning of large parts of 
this region thus seems to have a definite and easily explainable relation 
to this occurrence. I[ wish to make it clear, however, that the dryness 
is the primary and the abandoning a secondary cause. 
The species has been present in general in northeastern Wyoming, 
the larger part of South Dakota, and northern half and western third 
of Nebraska. In some of these regions, especially in South Dakota, 
the situation became very serious indeed. 
The swarms mentioned, with the exception of the one in the Snake 
River region, have moved southward about 200 miles, and naturally on 
account of their sojourn in the subpermanent region under unfavorable 
conditions have become weakened, as shown by the return flight. There 
has been no fresh invasion from the permanent regions. Therefore this 
species will occur in South Dakota, Nebraska, and northern Kansas 
next season, but the damage will be less noticeable than that done this 
season. 
Regarding the non-migratory species.—The past season has been one 
of unusual abundance and of consequent damage in South Dakota, 
Nebraska, and parts of Oregon and Washington; the normal amount 
of damage in Colorado and of less than the normal amount in Wyoming 
and Montana. The species concerned are numerous and the conditions 
so diverse that it seems hazardous to make a general statement regard- 
ing the situation next season. However, I believe I may state that it 
seems certain that the exceedingly damp season in Oregon and Wash- 
ington, interfering with egg depositing, and the abundance of parasites 
will reduce the number of locusts materially. In Kansas and Nebraska 
the effects of a wet spring have been counteracted by the opposite 
effect of a favorable season for egg depositing. Hence, allowing for 
the natural increase of parasites, the situation here next season will be 
neither better nor worse. In Colorado the situation will be the same 
next year and further, as long as present practices persist. 
Acridium shoshone Thos. has been found increasing in the fruit-raising 
district of the Grand River Valley in Colorado. 
Dissosteira longipennis Thos. has not kept pace with the other species, 
and it appears that the former seeming indications of its becoming 
important are not to be fulfilled. 
Hippiscus corallipes Hald. has become numerous enough to cause 
damage, and seems to be on the increase. 
