Insects at the Campground

by Carl Strang

The overnight campout at Waterfall Glen Forest Preserve that concludes the Roger Raccoon Club provides opportunities to observe various aspects of natural history. Last week the campground’s gravel parking lot, damp from overnight rain, apparently held a good supply of dissolved minerals, as it attracted butterflies representing at least 5 species.

Most remarkable was this giant swallowtail, a species uncommon in DuPage County but encountered regularly in small numbers at Waterfall Glen. I believe their main food plant in northeast Illinois is prickly ash, an infrequent shrub.

After dark an orchestra of singing insects filled the forest with sound. Dominant that night were large numbers of common true katydids, with smaller numbers of scattered two-spotted tree crickets, rattler round-winged katydids, and oblong-winged katydids. I needed a photo of the last species, and was able to find one singing close to the edge of the woods.

This oblong-winged katydid is holding his wings apart in singing position. Rasp and file structures on the brown portions of the two wings are rubbed together to produce the song.

As it happened, some of the kids found another male on their tent in the morning. I gave them a brief lesson about it, and took another set of photos.

Here the wings are in their normal folded position.

Some of those singing insects represented my first observations of their species this year.

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