LOCUST NOTES. IN THE NORTHWEST. 5 1 



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 accurate 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 Lemhi 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 agaiu 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 followiug, 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 wbicu latter date, if none have already come, 

 the farmers consider themselves entirely safe as far as locust swarms 

 are concerned. From what 1 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 destruc- 

 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 Canon, 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, 

 Gibbou River, Lower Fire- Hole Basin, Henry's Lake, and on Camas 

 Creek. Their habits, of course, are already known, and need no further 



