44 THE PERIODICAL CICADA, 
wha, Lewis. Marion, Marshall, Mason, Mineral, Monongalia, Nicholas, Ohio, Pleas- 
ants, Pocahontas, Preston, Putnam, Randolph, Ritchie, Roane, Summers(?), Taylor, 
Tucker, Tyler, Upshur, Wayne, Webster, Wetzel, Wirt, Wood. 
Broop VI—Septendecim—1915. (Fig. 9.) 
This is an unimportant scattering brood designated as No. 7 by 
Fitch, XII by Walsh-Riley, and XVII by Riley. It is difficult to 
assign any very pointed relationship for this brood, either with pre- 
ceding or following broods, unless one adopts the suggestion made by 
Prof. W. EK. Castle that it represents a relatively old or played-out 
brood, and may thus be considered the parent of Broods V and VII, 
Fic. 8.—Map showing distribution of Brood V, 1914. . 
the former the offshoot by acceleration and the latter by retardation 
of development. (See pp. 28-29.) As stated elsewhere, however, it is 
more likely to be an assemblage of swarms of diverse origin. 
This brood, while not an important one, covers a much wider ter- 
ritory than any of the other 17-year broods. With the exception, 
however, of the two extremes of its distribution in the Northwest 
and the Southeast, respectively, the records are of scattering indi- 
viduals, in many localities only a few specimens being observed. To 
illustrate this graphically on the accompanying map (fig. 9), the 
small dots indicate localities where only a few specimens were 
observed or captured or a doubtful record and the large dots localities 
