[wildandcrazyrussian]

The map you provided is quite fascinating in that it looks as though the area just skips over this area (WV and southwest PA), when in fact we had the identical phenomenon 5 years ago (1999). For weeks there was a constant drone of billions of cicadas, and there were even warnings about hearing damage from walking in the woods. I wonder why there would be a different timefram.

[leadpenny]

Even though they have a 17 year cycle, I believe there are at least some broods that come up each year somewhere.

(I'm not sure if I understand what I just said - maybe someone else can)

[this_ol_patriot]

http://www.biosci.ohio-state.edu/~biodiv/Cicada_Project/TABLE.html

Check out this brood table and maps, very interesting.
The brood numbers link to maps.