CHRONOLOGICAL ACOOUNT OF DIFFERENT BROODS. a 
It not improbably overlaps some of the territory occupied by the septendecim Brood 
XIV, but Ido not think it extends into Kansas. 
In Illinois it occurs more or less throughout the whole southern half of the State, 
but more especially ocenpies the counties from the southern part of Adams County along 
the Mississippi to the Ohio, up the Ohio and Wabash Rivers to “dyar Conuty, and 
then across the center of the State, leaving some of the central counties in southern 
Iinois unoceupied. To be more explicit, I enumerate all the counties in whieh it 
undoubtedly oceurred during the present year (1868): Adams (south part, back of 
Quincy), Bond, Clinton (northwest corner, adjacent to Madison), Champaign, Coles, 
Crawford, Cumberland, Clay, Clark, Edwards, Edgar * (especially in the eastern part), 
Franklin, Gallatin, Hardin, Hamilton, Johnson, Jasper, Jersey, Jetferson, Lawrence, 
McLean (east end), Macon, Madison, Marion, Massac, Monroe, Pike, Perry, Piatt, 
Pope, Richland, Randolph, Sangamon, Saline, Saint Clair, Union (northeast corner), 
Washington, Wayne, Wabash, Williamson, and White. There were none the present 
year either at Decatur, in Macou County, or at Pana, in Christian County ; nor were 
there any at Bloomington or Normal, in McLean; vor in Dewitt County, which lies 
south of McLean ; nor in Spring Creek, Iroqnois County, which is northeast of Cham- 
paign 
In Kentucky, according to Dr. Smith, it occurred in the northwest corner of the 
State, about Paducah and adjacent counties sonth, in 1829, 1-42, and 1855, and it oe- 
enrred there in 186. 
In Arkansas it occupied all the northern counties in 1842, 1855, and 1268. 
In Alabama it occupied Russell and adjacent counties on the east side of Black- 
Warrior River in 1842, 1855, and 1268. 
In Tennessee it occupied Davidson, Montgomery, Bedford, Williamsou, Rutherford, 
and adjacent counties in 1842, 1855,t and 1868. 
In North Carolina it appeared in Mecklenburg County in 1829, 1842, 1855, and 
1868. 
In Sonth Carolina, the Chester distriet, and all the adjoining country to the Georgia 
line west and to the North Carolina line north, was oceupied with it in 1*16, 1829, 
1842, 1855, and 186s. 
In Georgia it has occurred in Cherokee County since the year 1816. 
In Louisiana it appeared in Morehouse, Caddo, Claiborne, Washington, and adja- 
cent parishes in 1855 and 1868. 
It also doubtless occurs in Mississippi and Indian Territory, though I am unable 
to specify any localities. 
1881.—This is not only by far the largest 15-year brood, but also one 
of the best known of all recorded broods, as can be readily seen from the 
numerous localities where it was observed in 1865 and at previous visits. 
Its reappearance in 1851 was equally well observed and recorded, and 
the communications received and the other dates collected that year 
nearly equal in number those received since 1868 relating to the other 
twenty-one broods combined. 
In Missouri and Illinois its localities are so well known and estab- 
lished in the above-quoted account that it would be supertiuous to give 
here in detail the numerous confirmatory reports of 1881 which I have 
from nearly every county mentioned above. In Illinois the extent of 
the brood was studied by Prof. S. A. Forbes, of Normal, and Mr. John C, 
* Edgar County also has the septendecim Brood III. 
t Though Cicadas occurred in Jarge numbers in Davidson County and other por- 
tions of Tennessee in 1855, and also in 1868, yet in Lawrence County they appeared 
in 1856, instead of 1855—another instance of a belated brood. 
