10 



Introduction. 



that will flow from the labors of the Commission 

 will, let us hope, be correspondingly great. 



The history of this Migratory Locnst, east of the 

 Rocky Mountain range, as recorded in the following 

 pages, presents certain marked features. We have, 

 first, the migrations of winged swarms in autumn, 

 from the mountain regions of the West and North- 

 west, into the more fertile country south of the 44th 

 parallel and east of the 100th meridian ; second, the 

 return migration of the progeny, as soon as wings are 

 acquired the next summer. It is the more fertile and 

 thickly settled country south and east of the limits 

 indicated, which suffers most, both from the insects 

 that sweep over it, and from the young that hatch 

 in its rich soil ; and it is principally this country 

 which, in this work, is designated as outside the 

 insect's native home, and in which it can never 

 become a permanent resident. The species does not 

 dwell permanently even in much of the country 

 north and west of those lines, but it flourishes more 

 and more toward the Saskatchawan, Swan River 

 and Red River Settlements of British America, and 

 westward therefrom. 



Another marked feature is the eastern limit of the 

 insect's spread, at a line broadly indicated by the 

 94th meridian, and the consequent security from, 

 serious injury east of that line. These three 



