210 THE CANADIAN NATURALIST. [Vol. V1U. 



Many of the grasshoppers observed, according to reports re- 

 ceived by Mr. Riley, in Dakota, at Fort Thompson, Yankton, 

 Fort Sully, Springfield, Fort Randall, and Bismark, flying north- 

 ward and north-westward at various dates in June and July, no 

 doubt eventually found their way north of the 49th parallel. 

 Those seen at Bismark about June 6th and 7th, probably 

 belonged to the earliest southern bands above referred to, and 

 judging from the dates given by Mr. Riley, may have been pro- 

 duced in Nebraska, or more probably even still further south. 

 A portion of the southern and eastern army probably reached 

 Montana, and may even have penetrated in diminished numbers 

 into the districts in the vicinity of Bow River. 



A considerable number of locusts appear to have hatched at 

 about the same date as in Manitoba, near the extreme western 

 margin of the plains, especially in the country near Bow River. 

 Foreign swarms arrived at Fort McLeod from the south-west, 

 depositing eggs ; and most of those hatching near Bow River, and 

 further north, seem to have gone south-eastward early in August. 

 No very definite or wide spread movement of swarms appears, 

 however, to have occurred during the summer of 1875 in this 

 region, nor, if we may judge from the very meagre accounts re- 

 ceived, in the corresponding portion of Montana. 



The following notes, representing the condition of affairs in 

 the Western States and Territories, south of the 49th parallel, 

 are abstracts of the accounts in Mr. C. V. Riley's work, already 

 referred to, and will serve as a basis of comparison : 



Texas and Indian Territory. Hatched in large numbers 

 early in spring in Texas and Indian Territory. Left in May, 

 and early in June, going for the most part north 



Kansas. Ravages confined to districts 150 miles long, 50 

 broad, along eastern border of State, this being the region where 

 most eggs laid in 1874. Hatching from April 6th to May 10th. 

 Flew north-west in latter part of May and first week in June. 



Colorado. Hatched pretty generally over the territory, ap- 

 pearing from early in May till July, according to elevation. 

 Prevalent direction of flight on departure south and south-east. 



Nebraska. Hatching ground limited to districts bordering 

 Missouri River. Insects produced early in May, and began to 

 fly northward about June 7th. Several swarms from more 

 southern regions passed north-westward over the State before 

 those hatching here took wing. 



