FLIGHTS OF LOCUSTS IN 1878. 
161 
son, invaded these areas. But that they laid few, if any, eggs will be 
seen by reference to Map 3 for 1878, where no hatching- grounds are in- 
dicated. 
In Colorado also many hatched about Greeley and Denver, but owing 
to the unusually heavy rains, with a light fall of snow, and cold weather 
late in April and early in May, the young died in great numbers. A 
few hatched in Lake County along the Arkansas, and in Park County, 
as well as iu the San Luis Valley and Wet Mountain Valley, while the 
injury from the unfledged locusts was greater than in any other part of 
the State. 
In New Mexico the valley of Taos was devastated by the unfledged 
young, and they were abundant at Las Vegas, and at Santa Fe north- 
ward to San Juan. 
In Wyoming the hatching-grounds this year lay between a point 50 
miles northeast of Laramie City extending to Custer near the Black 
Hills, and about Fort Beno, as well as in the valley of Hay Creek, while 
the flight of early swarms indicate that they originated from hatching- 
grounds situated not far northwest of Bock Creek Station and Como, 
on the Union Pacific Bailway. It seems also most probable that a few 
hatched out northeast of the Black Hills, as we have indicated on the 
map, small flights being seen ou the Belle Fourche in the Black Hills, 
about the middle of June, going westward. 
Iu Utah hatching-grounds of limited extent occupied tracts about 
Salt Lake City and Farmington, and many hatched out in the northern 
part of the Territory, viz, in Malade, Cache, Morgan, Weber, and Davis 
Counties. When fledged the locusts fled southward. 
In Idaho locusts bred in considerable quantities at Boise City, and 
when fledged it is most probable that these were the visitants which late 
in July and early in August proved so destructive to the southwest of 
Boise in the Bruueau Valley. 
The hatching-grounds iu Montana were evidently of considerable ex- 
tent, the young, when winged, almost wholly flying southward into 
Idaho and Utah, none to any extent, so far as known, flying eastward 
upon the plains. The young were observed hatching out in the valley of 
Marias River, also about Fort Benton, as well as near Fort Peck and Wolf 
Point, while extensive hatching-grounds extended along the Yellow- 
stone River from Froze-to-death Creek to Clark's Fork. 
In British America locusts hatched at Fort McLeod, northwest of 
Fort Benton. 
FLIGHTS in 1878. 
In 1878 the hatching-grounds were much more limited in number 
and extent than in the previous year. None worthy of mention existed 
east of the Rocky Mountains, and it was only in Montana that the 
young appeared to any considerable extent. Two small, scattered 
flights, causing, however, no local damage, crossed the southwest corner 
11 L 
