21 
for thirty years and more, and to hatch in limited quantities annually 
along the south side of these hills and on the edge of the adjacent plains, 
but never until this year have they become so numerous as to cause 
serious damage. This may be accounted for in two ways. First, they 
are like the locust, periodic in their increase and decrease, owing, pre- 
sumably, to the effects of parasitic and other enemies, and, secondly, 
because since their last appearance in destructive numbers most of the 
land now in cultivation has been opened up to irrigation and farming. 
The locusts, as found in 1891 by Prof. Lawrence Bruner, have almost 
wholly disappeared from this region. During a visit, July 30 to 
August 4, in Wood River Valley, I was able to find none to cause any 
alarm, only a few colonies of Camnula pellucida, and one noted for the 
bright blue of its legs, but which had not attained wings, and I was 
unable to determine its species, with scattered specimens of the usual 
residents, such as C. bivittatus, C. atlanis, and Dissosteira obliterates (f). 
The locusts have vacated and the cricket has taken possession. They 
have been increasing noticeably for the past three years, each year 
working farther out upon the valley, and ovipositing wherever the sea- 
son overtakes them, from the banks of Snake River to the tops of the 
mountains, 75 miles to the north. 
I collected insects on May 14, at Taponis, on the Wood River, 16 miles 
west of Shoshone, scarce a day old, and learn that they have been abun- 
dant between Taponis and the river, having hatched at various points 
in the valley. 
I learn that they hatched in considerable numbers on the top of the 
mountain iying east of the town of Hailey, close to the edge of the snow 
line, where the elevation is not less than 7,000 feet, as well as on other 
mountains to the west of Hailey and Bellevue. 
I can not learn that they prevail to the east of the valley of the Little 
Wood River, which is one of the branches of Wood River, or that they 
extend to the west more than about 100 miles. The south branch of 
Boise River takes its rise in the mountains adjacent to the Wood River 
and has its upper course infested with the crickets. Great quantities 
were carried down the Boise River and, finding their way into the irri- 
gating canals, were carried out onto the land in the country adjacent 
to Boise City, when they escaped by the millions and scattered over 
the land. So far as I can ascertain, they have all been destroyed which 
thus invaded the lower country before attaining their maturity. 
The farthest to the west in this region in which they have bred this 
year is in the foothills at the head of Indian Creek, 5 miles to the north- 
east of Bisuka Station, or as it is now proposed to call it, Orchard 
Farms, on the Union Pacific Railroad, in township 3 east, and range 1 
north, extending over to the headwaters of the Boise River. 
I found no crickets more than 3 miles north or east of Hailey. The 
territory covered by them may be described as being covered by all of 
Ellmore County, the west half of Custer and Logan counties. 
