BROOD VI—SEPTENDECIM—1915. 45 
represented by one or more dense swarms, such as are ordinarily 
_ characteristic of the species. Some of these records of scattering 
occurrence may be based on stragglers from preceding broods or 
accelerated individuals from following broods and therefore may not 
mean more than incipient swarms. Many of the records were secured 
in 1898, when a very careful canvass of the whole Cicada region was 
made by this Bureau with the assistance of the State entomologists. 
The reports obtained in 1898, if they may be relied upon, extend 
the range of the periodical Cicada in Wisconsin and Michigan much 
farther north than any of the old records. The localities assigned 
to this brood in North Carolina, South Carolina, and Georgia, and in 
Fic. 9.—Map showing distribution of Brood VI, 1915. 
eastern Kentucky and Tennessee are, in the main, in counties in the 
elevated mountainous district, and the correctness of the reference 
to this brood is established by earlier records as well as indicated by 
the elevation. 
Reports of the occurrence of this brood in Montana were sent in by 
Mr. E. V. Wilcox, with the statement that the insect occurred in 
smail numbers in the counties of Chouteau, Flathead, Gallatin, and 
Missoula, and that in the latter county some damage was done to 
young apple trees. This report was published in Bulletin 18 of this 
Bureau, but doubts arose afterwards in the mind of the writer as to 
the correctness of the determination of the Cicada, as the more 
