68 THE PERIODICAL CICADA. 
Broop XX—Tredecom—1908. (Fig. 23.) 
This is a small brood, founded on records given by Doctor Smith. 
Some of the localities cited were confirmed and others negatived on 
the recurrence of the brood in 1869, as reported by Professor Riley in 
Bulletin No. 8, old series, of the Division of Entomology. Since that 
date three doubtful localities have been added, one each for Virginia, 
North Carolina, and Georgia, possibly based on 17-year broods which 
appeared in conjunction with this brood. 
ERMONY 
v 
x 
' 
u= 
ty 
4’ 
? 
ye 
fa) 
{MISSOURI 
Fic. 23.—Map showing distribution of Brood XX, 1908. 
The distribution, by States and counties, is as follows: 
GrorGIA.—Banks, Greene, Jasper, Muscogee, Walker, Washington. 
NortH Carotina—Wilkes (?). 
VirGinia.—Wise (?). 
3roop XXI—Tredecim—1909. (Fig. 24.) 
This is one of the broods representing the extreme southern range of 
the Cicada, and was recorded by Doctor Smith in Florida as occurring 
in 1844 and 1857. Its existence was confirmed in 1870, when records 
were obtained indicating its extension also into Alabama, Mississippi, 
and Tennessee. 
It is a brood which, according to report, does not seem to occur in 
dense swarms, but scatteringly, at. least in its more northern range. 
