ENT me DUCTION. 
This Bulletin includes the report by Mr. Lawrence Bruner of his ob- 
servations in the Northwest during the summer and fall of 1882; some 
memoranda of experiments with kerosene emulsions on the Chinch Bug 
“by Prof. S. A. Forbes, State Entomologist of Illinois, and which he has 
kindly sent to the Department because undertaken at our suggestion; 
and extracts from the correspondence of the Division. 
The general scarcity of the Rocky Mountain Locust (Caloptenus spretus), 
observed by Mr. Bruner in the regions explored, tallies with the obser- 
vations made by others in the West and Northwest during the same 
period, so far as we have any knowledge thereof. Dr. ©. A. White, on 
behalf of the Geological Survey, traveled up and down the Yellowstone 
Valley for 100 miles from its confluence with the Missouri; 50 miles up 
and down this latter stream, from the mouth of the Yellowstone, and 50 
miles east of Glendive, on the line of the Northern Pacific Railroad. 
During this field-work he very kindly made observations on C. spretus. 
Very few were seen near the mouth of the Yellowstone, and but a few 
in the air during a portion of a single day in the latter part of August. 
No memorandum of the direction taken by these was made. Prof. Samuel 
’ Aughey has also furnished the following notes: 
On June 21, 22, and 23, I was in the North Loup Valley, between Saint Paul and 
Ord, and beyond, 35 miles. During these days a few locusts were flying from the 
northwest towards the southeast. A few dropped here and there, so that there was 
no mistake as to the species. There were not enough to do any material damage even 
had they all alighted. Ihave made diligent inquiry in all directions, but failed to find 
where they migrated to. Some cow-boys whom I met stated that a few hatched in 
the sand-hills south of the Niobrara, or between the latter stream and the headwaters 
of the Loup. If this could be confirmed it might be inferred that those seen migrating 
came from that locality. 
On August 21, I encountered a few locusts on top of Rattlesnake Mountain. Said 
mountain is 85 miles or thereabout north of Rawlins, on the Union Pacific Railroad. 
Height of mountain, 6,900 feet above sea-level (by my barometer). They were coming 
from the northwest. : 
A week later I found a few scattered over the ground at the head and along the 
valley of Powder River. I also found a very few on September 2, near Searght’s 
Ranche, on the North Platte, about 35 miles north of the month of Sweetwater River. 
This is a meager account, but I was on the lookout all the season, and fonnd no 
Caloptenus spretus elsewhere. 
Dr. H. A. Hagen and Mr. Samuel Henshaw, who were also out during 
the same period on a tour of investigation for the Northern Pacific Rail- 
road, in Montana and Washington Territory, have informed us that, 
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