NEW RECORDS OF MICHIGAN CICADIDAE (HOMOPTERA), WITH NOTES ON THE USE OF SONGS TO MONITOR RANGE CHANGES

We present records of Diceroprocta vitripennis, Tibicen chloromera, an d Tibicen pruinosa (new state record) in Michigan. Monitoring geograph ic range changes and population size differences by song suggests seve ral population situations for cicadas: (1) sizable populations in most areas of apparently good habitat; (2) widely separated single individ uals or small populations on the edges of populated regions, represent ing range extensions that may be of limited duration; (3) one or a few individuals present only once, probably transferred in soil on roots, and ultimately unsuccessful. Species-specific calling songs allow sen sitive measurement of species' range changes.