672 The Rocky Mountain Locust. [ November, 
4.) No two successive hatchings of an extensive and disastrous 
nature can take place in the same region. 
The possibility of exception to the rules would be in keeping 
with the character of all rules; but I am convinced that the ex- 
ceptions will ever prove most trifling. Now there is a deal of 
satisfaction to be drawn by our farmers from these rules, which 
not only limit locust disaster but enable them to anticipate 
events; and I need hardly state that the accuracy of my own 
prognostications, repeatedly made during the past three or four 
years, was in no small degree due to them. 
We have had the spectacle of the Rocky Mountain locust, in 
what I call the return migration, flying over some parts of the 
vast territory from the 29th parallel to the Dominion boundary 
line, and from the 94th meridian to the mountains, all along from 
the end of April till the beginning of August, and with so little 
injury that, with the exception of the case in Montana, just men- 
tioned,' the question everywhere asked is, Where have the flying 
‘hoppers gone? What has become of them? I answer that, as 
in previous years, and as I have always held would be the case, 
they were, in the main, so diseased and parasitized that they 
dropped in scattered numbers and mostly perished on their north- 
ward and northwestward journey. This is no theory, but known 
to have been the case in the more thickly-settled parts of Kansas, 
Nebraska, Iowa, and Minnesota, from which the insects that had 
dropped have been reported, and in some cases sent to me. But 
as the flight is for the most part over the vast and thinly-settled 
plains of Indian Territory, Kansas, Nebraska, and Colorado, 
the number that has dropped and been lost to sight-in said plains 
is infinitely greater than that which has been observed to come 
down in the more thickly-settled regions to the east. 
The more dense and extensive swarms that flew before the 1st 
of July reached, I have little doubt, the great thinly-settled 
plains and prairie region of Northwest Minnesota, Dakota, Mon- 
tana, and British America, — embracing in the latter case most 
of the country between the projected line of the Canada Pacific 
and the boundary line, and between Manitoba and the Rocky 
Mountains. I found the insects sparsely spread over the rank 
prairies west of Brainerd along the Northern Pacific and along 
Red River; and by this I mean that a few would hop from the 
grass at every step, wherever I searched for them. I met with 
only here and there a straggler in Manitoba ; but early in July 
1 Referred to in the portions omitted. — ED. 
Ni- 
