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immense numbers, was the Dissosteira longipennis, an insect usually 
considered rare in collections and one heretofore only known to occur 
over the higher portions of the plains lying to the eastward of the 
Rocky Mountains, in the States of Wyoming, Colorado, and New Mex- 
ico. This insect, as ascertained from inquiry, covered an area of about 
400 square miles of territory in sufficient numbers to materially injure 
the grasses growing on the ranges of the entire region, and amongst 
these grasses the species of Bouteloua or Gramma grasses, and the 
Buffalo grass, Buchloé dactyloides. Grains and other cultivated plants 
did not appear to be especially attractive to it. In fact very little or 
no injury was done by it to the cultivated crops growing within the 
region infested. About the same time that I was investigating this 
insect upon its northern line of injury Professors Snow and Popenoe 
were studying it upon the southern border of its range, and they found 
practically the same food habits there that I had noted in the north, and 
by inquiry found that the insects had come into that country from the 
south last fall and had laid their eggs overa large area. This year when 
the eggs hatched the young began to move from their breeding centers 
in all directions, seeking open places and the edges of plowed fields and 
following roadways. This trait of seeking open spots this season is 
probably due to the habit of the insect of naturally living on open 
ground, where grasses are short and scattering. The present year was 
very wet in this particular region and caused an undergrowth of grasses; 
hence the desire to find the natural conditions under which the insect 
lives. The young began moving, and, finding these open places, con- 
gregated there. Having thus congregated, they must naturally feed, 
and they swept the grasses clean around these spots. So noticeable 
was this that, in certain spots where they had gathered about the hiils 
of a species of ant which raises mounds of small gravel and cuts away 
the vegetation for some distance around them, they had enlarged these 
areas in some places for fully half an acre. This year Messrs. Snow 
and Popenoe observed them flying southward with such ease, by reason 
of their long wings, that they resembled birds. 
Dissosterra obliterata, Thomas.—Closely related to the above, and 
very Similar in appearance to it, is a second species of these large, 
long-winged locusts, which was found in injurious numbers along with 
Camnula pellucida in Idaho last year. It was quite common in the 
Wood River country lying north of Shoshoneand in the vicinity of 
Boisé City, Idaho. One form of this species was described by Saussure 
as Dissostetra spurcata in his Prodromus Gidipodorum. This is not the 
(Hdipoda obliterata of Stoll. 
Camnula pellucida.—This is the insect which has oceasionally been 
very destructive in parts of California and Nevada. It has since spread 
eastward into Idaho, where it is very destructive the present season, 
covering an area of at least 1,300 square miles of territory. It also 
appears in great numbers, with severa! other species, in the led River 
