No. 4.] DAWSON — LOCUST INVASION OF 1875. 209 



tween Lake Crystal and St. James on Wednesday last. A few 

 days later they were observed at New Ulm flying south-east, and 

 at noon of the same day struck the line of the road at Madelina, 

 St. James, Fountain Lake, Windom, and Heron Lake, covering 

 the track for about 50 miles of its length." It will be observed 

 on referring to the summary on another page, that the insects 

 produced in Minnesota itself flew south-west in the early part of 

 July. 



I have not been able to trace further the movements of these 

 Manitoba broods, unless indeed it be supposed that some at 

 least of the swarms which passed over central Illinois early in 

 September, came from that quarter. These, however, Mr. Riley 

 believes not to have been the true migratory locust — Caloptenus 

 xpretus. 



Foreign swarms from the south crossed the 49th parallel with 

 a wide front stretching from the 98th to the 108th meridian, 

 and are quite distinguishable from those produced in the 

 country, from the fact that many of them arrived before the 

 latter were mature. These flights constituted the extreme nor- 

 thern part of the army returning northward and northwestward 

 from the states ravaged in the autumn of 1874. They appeared 

 at Fort Ellice on the 13th of June, and at Qu'Appelle Fort on 

 the 17th of the same month, favoured much no doubt by the 

 steady south and south-east winds, which according to the mete- 

 orological register at Winnipeg, prevailed on the 12th of June 

 and for about a week thereafter. After their first appearance, 

 however, their subsequent progress seems to have been compara- 

 tively slow, and their advancing border very irregular in outline. 

 They are said to have reached Swan Lake House — the most 

 northern point to which they are known to have attained — about 

 July 10; while Fort Pelly, further west, and nearly a degree 

 further south, was reached July 20th, and about seven days 

 were occupied in the journey thence to Swan River Barracks, 

 a distance of only ten miles. It is more than probable that the 

 first southern swarms were followed by others, which mingled 

 with them, or even, in parts of Manitoba and the country im- 

 mediately west of it, with the indigenous brood. From a few 

 localities only, in Manitoba — and those in its western portion — is 

 the evidence pretty conclusive as to the arrival of foreign swarms 

 from the south. Burnside, Westbourne, Portage La Prairie, 

 Rockwood, and Pigeon Lake, may be mentioned as affording 

 instances. 



