The Cicada.
by Roig61
There are two major groups of Cicada. The long cycle or Magicicada and the shorter cycled species, the so called Dog Day cicadas in Tibicen, Okanagan and Neocicada which can have cycles as short as four years and emerge every year in overlap. There are 137 species in all groups in North America. All are capable of sometimes impressive sounds. The massive hatches of 17 year cicada can be one of the most overwhelming sounds in nature. I heard the 13 year hatch in 2002 and was amazed.
The largest Tibicen in our area is T. auletes. Known as the Northern Dusk-singing (see above). Also seems to be the dominant singer in my woods, at least in July. Several species have the greening at the wing base and auletes is known for the cottony dust up over the body that is very variable apparently.