APPENDIX 0. 
DR. GIDEON B. SMITH'S CHRONOLOGY OF THE PERIODICAL 
CICADA. 
[From a copy, by Dr. J. G. Morris, of Dr. Smith's unpublished manuscript.] 
It is proper to remark in relation to the districts in this tribe or 
division that there is some uncertainty in relation to some of them 
(as well as to those of the northern division) that have their borders 
on the great line that separates the two divisions, owing to the fact, 
remarked upon in another place in this work, that the districts often 
interlock, those of the northern running down into the territory of the 
southern and those of the southern running up into that of the northern 
division, sometimes for hundreds of miles. A remarkable instauce of 
this will be found in the case of the southern Illinois district, which 
ascends to the north nearly three degrees of latitude above the regular 
line of division ; and also to the lapping of one district over another 
on their respective boundaries, elsewhere noticed. The reader will, 
therefore, make due allowance for such errors as he may find in the 
dates of appearance. 
REGISTER OF THE SOUTHERN TRIBE (THIRTEEN-YEAR LOCUSTS!. 
1842. Illinois. — In Washington, Jefferson, Franklin, Perry, Randolph, Monroe, St. 
Clair, Madison, Bond, Clinton, Edwards, Marion, and adjacent counties in 
the southern end of the State, in 1829, 1842, 1855, and again in 1868. Of this 
there is great doubt whether it belongs to the seventeen-year tribe, as is 
indicated by the following paragraph from the Baltimore Sun of June 13, 
1859: "The locusts have made their appearance in Egypt, in southern 
Illinois, and cover woods and orchards in swarms." 
1842. Kentucky. — Northwest corner of State, about Paducah and adjacent counties 
in the south, in 1829, 1842, 1855, and again in 1868. 
1842. Alabama. — Russell and adjacent counties on the east side of Black Warrior 
River, in 1842, 1855, and again in 1868. 
1842. Louisiana. — Morehouse Parish, Caddo, Claiborne, Washita, and adjacent par- 
ishes, in 1855, and again in 1868. 
1842. Arkansas. — All the northern counties in 1842, 1855, 1868. 
1842. South Carolina. — Chester district and all adjoining to the Georgia line and to 
North Carolina north [ward] in 1816, 1829, 1842, 1855, 1868. 
1842. Tennessee. — Montgomery, Bedford, Williamson, Rutherford [and adjacent 
counties], in 1842, 1855, and again in 1868. 
1842. Georgia.— Cherokee County in 1816, 1829, 1842, 1855, 1868. 
1842. North Carolina.— Mecklenburg County in 1816, 1829, 1842, 1855, 1868. 
1842. Missouri.— All southeast part in 1829, 1842, 1855, 1868. 
1843. Georgia. — Habersham and Rabun ( ?) counties in 1843, 1856, 1869, 
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