by Carl Strang
The swamp cicada (Tibicen tibicen, the scientific name recently changed from T. chloromera) is another species whose northern range limit is within the 22-county area I am surveying for singing insects.
They are present mainly as widely scattered individuals in DuPage County, and sing in the morning. As my survey work this year was taking place mainly in the afternoons and evenings, I hadn’t heard any, and thought I would not. Then, last week, while on the job up at West Branch Forest Preserve, I heard one singing near the lake.
This observation not only is the latest I have heard a swamp cicada singing, it also extends the known northern range boundary.
At some point I will need to do more morning survey work in the southern counties of the region, to get a better handle on this species’ abundance and geography.