No. 145.] 
743 
insect to be noted throughout the world. And it was, doubtless, 
from its suddenly appearing in such vast numbers, at long inter¬ 
vals of time, like the Migratory Locust of the East, that the early 
settlers of this continent gave it the name of “ Locust,” by which 
it is now universally designated; although it is wholly unlike 
those insects which are properly termed locusts, both iu its form 
and habits. 
Another remarkable fact with respect to this species is, that in 
different districts of our country broods appear in different years; 
yet the brood of each district invariably preserves the interval of 
seventeen years for coming out in its winged state. We have 
three of these broods partly within the bounds of the State of 
New-York, and there appear to be at least six others in other 
parts of the United States. 
One of these inhabits the valley of the Hudson River. Its nor-. 
them limit is the vicinity of Schuylerville and Fort Miller, and 
this appears to be the most northern point to which this species 
anywhere extends. From thence it reaches south along both 
sides of the Hudson to its mouth, where it extends east, at 
least to New-Haven in Connecticut, and west across the north 
part of New-Jersey and into Pennsylvania. Its last appearance 
was in the year 1843, and it will consequently make its next ap¬ 
pearance in 1860. 
The second brood occurs in Western New-York, Western Penn¬ 
sylvania, and Eastern Ohio. The last year of its appearance was 
1849; it will consequently reappear in 1866. 
The third brood appears to have the most extensive geographi¬ 
cal range. From the southeastern part of Massachusetts it ex¬ 
tends across Long Island and along the Atlantic coast to Chesa- 
pealc Bay, and up the Susquehanna at least as far as to Carlisle in 
Pennsylvania. And it probably reaches continuously west to the 
Ohio, for it occupies the valley of that river at Kanhawa in Vir¬ 
ginia, and onwards to its mouth, and down the valley of the Mis¬ 
sissippi probably to its mouth, and up its tributaries, west, into 
the Indian territory. This brood has appeared the present year, 
1855, and I have received specimens from Long Island, from 
