4 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
The Rocky Mountain Xeirs of October 30, 1878, reports from Rismank, 
Dak., September 1 and 2, locusts flying southerly at great altitudes; on 
September 3, " on the ground and a few in the air, number decreasing 
rapidly;" on the 4th, very few on the ground, none in the air; Septem- 
ber 5, C, and 7, rapidly decreasing and many dying ; September 9, (lis- 
appeared. 
The same newspaper, of the same date, reports from Yankton, Dak. y 
locusts somewhat numerous until about September 12, and disappearing 
almost entirely after the cold weather of the 26th. 
THE LOCUST IX COLORADO IX 1878. 
The Rocky Mountain Locust during the summer of 1878 bred sparingly 
throughout the mountainous portion of the State. We found them not 
uncommon on the road to Gray's Peak, five or six miles from George- 
town, at an elevation of about 9,000 feet, August 20. On the extreme 
summit of Gray's Peak a few were seen flying by the workmen on the 
Summit House, then building, and I found several under stones, be- 
numbed with the cold. At an elevation of about 12,000 feet they were 
common on the *' alpes." or grassy slopes, leaping and flying when the 
sun was shining. 
We were informed that a swarm was seen in South Park, August 14, 
flying east for an hour or two. It breeds annually in Snake and Bear 
River Valleys, but none had been seen the present summer in Snake 
River Valley. 
We were also told that August 13 and 14 locusts were abundant in 
Estes Park ; they were seen flying in the air in large numbers ; and it 
was feared that they would lay their eggs, the ground being covered with 
them. We were also told that they bred this summer in small quanti- 
ties in Gilpin County, especially on the Bear Mountains. At Summit, 
August 26, locusts were observed flying southwest with the wind. (United 
States Weather Signal Reports.) From these facts we judge that Calop- 
tenus spretus bred sparingly in 1878 throughout the more elevated por- 
tions of Colorado, not existing in its normal numbers, and nowhere 
sufficiently abundant to gather into large, destructive, migratory swarms, 
though locally migratory. Later in the season we received the following 
information from Mr. William X. Byers : 
September 10-13 I was in Northern Colorado. I found them abundant on White 
River, at White River Indian Agency, and extending up that river four miles (proba- 
ably further) and down it an unknown distance ; also, northward about forty miles, 
diminishing in numbers from south to north ; also, a few along the Upper Bear River 
Valley. They were depositing eggs. 
THE LOCUST IX WYOMING IX 1878. 
Along the hue of the Union Pacific Railroad the locust had not been 
seen this year, except in very limited numbers. Near Summit Station 
they had bred in the bottoms, but only in sufficient quantities for 
bait both this summer and in 1877. At Laramie City we were informed 
