44 
THE PERIODICAL CICADA. 
whu, Lcwit;. Marion, Munshall, Mason, Mineral. Monongalia, Nicholas, Ohio, Pleas- 
ants, Pocahontas, Preston, Putnam, Randolph, Ritchie, Roane, Sunimers(?), Taylor, 
Tucker. Tyler. I^shur, Wayne. Webster. Wet/el. Wirt. Wood. 
liiiooD VI — Septemleciin — 1915. (Fig. 0.) 
This is an unimportant scattering brood designated as Xo. 7 by 
Fitch, XII by Walsh-Riley, and XVII by Riley. It is difficult to 
assign any ver}^ pointed relationship for this brood, either with pre- 
ceding or following broods, unless one adopts the suggestion made by 
Prof. W. E. Castle that it represents a relatively old or played-out 
brood, and may thus be considered the parent of Broods V and VII, 
Fig. 8. — Map showing distribution of Brood V, 1914. 
the former the offshoot b}^ 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 vSoutheast, 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 ca})tiired or a doubtful record and the large dots localities 
