Seeking Northern Limits: Swamp Cicada

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.

Swamp cicada. This species is largely black, highlighting the white patches at the anterior end of the abdomen.

Swamp cicada. This species is largely black, highlighting the white patches at the anterior end of the abdomen.

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.

He was in one of these small trees. This habitat resembles an area at Springbrook Prairie near the south boundary of DuPage, the only place in the county where I have heard several swamp cicadas singing at once.

He was in one of these small trees. This habitat resembles an area at Springbrook Prairie near the south boundary of DuPage, the only place in the county where I have heard several swamp cicadas singing at once.

This observation not only is the latest I have heard a swamp cicada singing, it also extends the known northern range boundary.

Swamp cicada observations in DuPage County. The West Branch location establishes the species in the northern half of the county.

Swamp cicada observations in DuPage County. The West Branch location establishes the species in the northern half of the county.

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.

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