LOCUST NOTES IN THE NORTHWEST. 55 
Utah and southern Idaho; it is also quite impossible for me to give 
any of the particulars as to dates, &c. Thus far (August 23) we have 
not met with a single C. spretus in Idaho, nor have we heard of their 
presence in any portion of the Territory. But as there is no aceurate ac- 
count extant of the locust history for the region of Salmon River Valley 
and adjacent country, it may be well to give it in brief here. The first 
reliable account that I could obtain in reference to locust swarms dates 
back to the summer of 1869, when they came in from the Snake River 
by way of Birch Creek and Wood River, and followed northward down 
both the Lemhi and the main branch of the Salmon to about Salmon 
City. These deposited eggs, thereby giving young locusts for 1870. 
Again, in 1871, locusts appeared in the vicinity of Lembi Agency and 
Salmon City. From this time on till the summer of 1875 [I was unable to 
learn of their appearance or presence in this portion of the Territory, 
but during this year (1875) they again appeared in great numbers, coming 
as before from the southeast and south, following down the valleys of 
the two rivers heretofore named. This summer, as well as during the 
three following, they deposited great numbers of eggs and proved ex- 
ceedingly injurious to the few crops of grain and vegetables that were 
planted in the country (valleys). Since 1879, however, they have en- 
tirely disappeared from these regions. The time of their appearing in 
the valley of the Salmon, I am told, varies from the middle of June to 
the first of August, after which latter date, if none have already come, 
the farmers consider themselves entirely safe as far as locust swarms 
are concerned. From what I could learn, there are no exceptions to the 
northward movement of swarms of C. spretus in this particular portion 
of Idaho, and judging from the surface configuration of the lower Salmon 
River country, I would imagine that all swarms leaving must cross over 
the range to the headwaters of the Bitterroot and Big-Hole Rivers, 
which streams they follow down, and thereby divide and reach different 
portions of the Territory of Montana. As far as my inquiries went, no 
data were obtained of methods having been adopted for their destrue- 
tion in the various stages of their growth, which differed in any way 
from those used in other portions of the West, and already described 
in former reports. The parasites, too, do not appear to have varied 
from those in other sections of the locust area. 
CAMNULA ATROX. 
In connection with the migratory locust this insect deserves separate 
notice, as it has been observed at various points along our route from 
Fort McKinney to Beaver Cation, Idaho. At some of the points where 
seen it was quite numerous and threatened mischief, while at others 
there were but a few isolated specimens observed. 
We observed them at the following localities: Bozeman, Trail Creek, 
Gibbon River, Lower Fire-Hole Basin, Henry’s Lake, and on Camas 
Creek. Their habits, of course, are already known, and need no further 
