14 
Bulletin ioi. 
and floated down the river, but the rest succeeded in crossing. A 
glance at the map will show that they found themselves immediately 
in the William’s River mountains. Here they located and laid 
eggs which hatched the following spring as soon as the snow began 
to melt. The young endured the rigors of the season without 
apparent inconvenience. Frequently at night they would freeze, 
only to thaw out the next day and renew operations. Sometimes 
they were buried beneath the snow, where they remained until that 
was melted. 
Three years later (1882), a horde visited Hayden, a town 
north and east of Hamilton on the opposite side of the William’s 
River mountains. During this visitation they did considerable 
damage to gardens and crops, which at that time, however, were 
not so important a feature as they have since become. It seems 
probable that the drove which visited Hayden were the descendants 
of those at Hamilton three years before. The first brood may have 
found a temporary home in the William’s River mountains, in 
which they gathered sufficient strength to make the invasion into. 
Hayden. 
We have two records of the next great migration, which oc¬ 
curred in 1895. They were made at Hamilton and at Lay. The 
first was observed by Mr. Hamilton, and the second by Mrs. Calla¬ 
han. Lay is located thirty miles west of Hayden and seven miles 
north of Bear river. The drove, which was not very large at this 
place, came from the southwest and went north. The remarkable 
feature is that the insects must have come across Bear river, since 
there are no hills between this and the river where they are lo¬ 
cated. The original brood must have been enormous, for even 
the large numbers at Hayden this year failed to effect a crossing. 
The band was evidently following up the valley of Juniper creek. 
It is not an uncommon habit for the insects to follow a river valley 
when migrating. The general direction of the broods must have 
been more northerly than usual, for this is the only record we have 
of a visit to this locality. 
The third great migration reached Hamilton in 1900 and a 
second wave followed in 1902. Both crossed the William’s Fork 
as the previous broods had done. During the last trip they de¬ 
stroyed twenty-five acres of grain belonging to Mr. Hamilton, who 
herded them off the garden with partial success. Attempts were 
made to poison the insects with Paris green and to kill them with 
kerosene oil, but owing to the immense numbers these methods 
were of little avail. 
Eggs were laid again in the Hayden divide and apparently, at 
least, gave rise to the unprecedented numbers of 1904. It is not 
quite certain how long the insects have been located on the Hayden 
divide. Some say that they have been there for the past ten 
