BROOD XIII—SEPTENDECIM—1922. BY, 
MaryLanp.—Frederick County and Baltimore. 
Oxntro.—Vinton County. 
West Virainta.—Cabell County. 
Broop XIII-—Septendecim—1922. (Fig. 16.) 
This very compact brood, described by Fitch as Brood No. 6, by 
Walsh-Riley as Brood III, and by Riley as Brood V, covers in large 
part a prairie or sparsely wooded region extending over portions of 
several States in the upper Mississippi Valley. 
A detached brood was formerly known in Pennsylvania, but seems 
not to have been seen in later years. A few individuals were reported 
SWWER MONT 
= 
> 
a 
Ss 
o 
o 
0) 
0) 
v 
D 
Fic. 16.—Map showing distribution of Brood XITI, 1922. 
from two counties in Maryland in 1905, and two very doubtful records 
(1888) have been found for Kentucky and Virginia. Mr. Hopkins 
in his Bulletin 68 gives records indicating possible swarms in Putnam 
and Lincoln counties, W. Va. None of these eastern records can have 
other than chance time relation with the main area covered by this 
brood. 
As the periodical Cicada is limited to forested areas, the broods 
occurring in prairie districts of northern Illinois and adjoining States 
are necessarily much broken and scattered, and Brood XIII occurs, 
therefore, for the most part in small colonies in woods bordering 
streams. No special effort was made to get records in 1905, and this 
