BROOD XVI—SEPTENDECIM—1908. 63 
In Bulletin 14 and older publications a western outpost in Boulder 
County, Colo., was reported for this brood. This record is undoubt- 
edly erroneous, and arises from the confusion of one or other of the 
mountain species of Cicada which also have life cycles of several 
years and duplicate somewhat the habits of the eastern species. 
Prof. C. P. Gillette, in answer to an inquiry by the writer, states 
that he does not believe that septendecim occurs in Colorado, inasmuch 
as he has not found a single example of it in the course of the insect 
collecting done there by himself and students during the last sixteen 
years, and he suspects that the insect reported is Tibicen rimosa Say, 
which might readily have been mistaken for septendecim. 
= 
o 
o 
1) 
a) 
v 
a 
Fig. 20.—Map showing distribution of Brood XVII, 1909. 
The distribution, by States and counties, is as follows: 
ARKANSAS.—Franklin. 
lowa.—Lee (?). 
NeBRASKA.—Richardson. 
Broop XVII—Septendecim—1909. (Fig. 20.) 
This brood is a precursor of Brood I, and was indicated by the 
writer in Bulletin 18 (mew series) of this Bureau. It comprises 
small or doubtful colonies only. The records given in that publica- 
tion are reproduced below without change except for the addition of 
two new localities for Virginia, one in Appomattox County and 
the other in the southwestern part of Washington County. 
