APPLE TWIGS, LOCUST DIFFERENT BROODS. 39 



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 w r hich are properly termed locusts, both in 

 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- 

 thern 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, w r here 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- 

 peak 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 jDresent year, 

 1855, and I have received specimens from Long Island, from 



