One Last Look Back

by Carl Strang

My recent blog posts have shared highlights of this year’s field season, as I searched for singing insects in the 22-county area I define as the Chicago region. Those accounts haven’t told the whole story, though, and I have a few last photos to shake out of the bag. These fill out some of the experience of doing this kind of regional study.

For instance, other animals have enhanced the delight.

The chalk-fronted corporal is a dragonfly I have encountered only in the northern portion of the region, in this case at the Lulu Lake Nature Preserve in northern Walworth County, Wisconsin.

Walsh’s grasshopper was a new one for me. Not a singing species, but an interesting find at the Poverty Prairie in DuPage County’s Waterfall Glen Forest Preserve.

Turkey vultures assemble at dusk on the Culver, Indiana, water tower. My travels take me back to my home town a few times each season.

Interesting and beautiful scenes are to be found in the relatively undisturbed wild areas which are my main destinations.

An early evening rainbow at Conrad Station in the Indiana Kankakee Sands presaged a thunderstorm-dodging drive home on July 2.

Pinholes between tree leaves cast solar eclipse shadows at Blackwell Forest Preserve. Though the moon covered around 90% of the sun at peak, I detected no change in singing insect activity.

One of the more beautiful scenes was this panne in the Indiana dunes.

I had hoped to find delicate meadow katydids in the pannes. Dusky-faced meadow katydids were a good find there, but that species has a solid hold in other dunes wetlands.

The Pembroke Savanna in the Illinois Kankakee Sands is one of my favorite sites.

I believe these white pines at Warren Dunes State Park in Berrien County, Michigan, are the same ones where Richard Alexander found treetop bush katydids in 1971. He described the trees as small, but all are tall now. They still foster pine tree crickets, but I did not find any bush katydids.

I ended up with 115 county records for the season, totaling all newly found singing insect species over all the counties.

So far, I have found sprinkled grasshoppers only in oak savannas on sand soils.

Dusky-faced meadow katydids at the Indiana Kankakee Sands were a Newton County record.

This curve-tailed bush katydid at the Jasper-Pulaski Fish and Wildlife Area in Indiana provided a Jasper County record for my study.

I found a healthy population of long-tailed meadow katydids, including this brown-legged male, at Ferson Creek Fen in Kane County.

The Ferson Creek population also had green-legged variants, including this female.

Lisa Rainsong, Wendy Partridge and I drove south to Loda Prairie to check out the bush cicadas there. I concluded this year that the species does not occur in the Chicago region.

This Texas bush katydid was singing in early October at Springbrook Prairie Forest Preserve, DuPage County. I had an observation of this species on October 17, my latest ever in the region.

Most of the long winter remains, and as I compile data, write reports, and visit museums, I will be looking forward to another collection of rich experiences as I resume my field study in 2018.

 

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Psorting Out Psinidia

by Carl Strang

This year I found longhorn band-winged grasshoppers (Psinidia fenestralis) in Newton County, Indiana, Kenosha County in Wisconsin, and Lake and Cook Counties in Illinois. Previously I had found them in Porter and Marshall Counties, Indiana.

Longhorn band-winged grasshoppers are named for their disproportionately long antennae.

The hind wings of these small grasshoppers usually are bright red.

Two of the newly found populations raised questions. First, at Burnham Prairie in Cook County, they had bright yellow hind wings, in place of the usual red.

I learned that yellow hind wings are known to appear occasionally in the species.

Then I found red-winged ones in the same spot at Illinois Beach State Park where I found insects I had identified as Kiowa rangeland grasshoppers (Trachyrhachys kiowa) in 2014.

That original identification was based on one individual I captured with this wing pattern.

Kiowa rangeland grasshoppers typically have transparent bases in their hind wings, but these can be pale yellow. That fit my photos, and there are historical records for Lake County, Illinois, so I felt that my identification was correct. Now, poring over references and my photos, and going back and forth in my conclusions, I have decided that the 2014 grasshoppers in fact were Psinidia, and the individual I caught was an unusual one with transparent hind wings. The antennae had flattened bases and were as long as the hind femurs, like Psinidia but unlike T. kiowa, which have shorter, finer, rounder antennae. The hind tibias were largely bluish, but had black bands, then yellow, then black at their proximal ends, like Psinidia. Reference photos for kiowa show blue tibias interrupted by yellow bands toward the proximal ends, but no black.

Confusion between these two species is understandable: both are small, and both have heads that protrude above their thoraxes. Unfortunately, this removes the only present-day record I had for Kiowa rangeland grasshoppers in the Chicago region. I still hope to find them, because historical records place them not only in Lake County, Illinois, but also Will County, and Lake, Newton, and Jasper Counties in Indiana.

Seeking Seasides

by Carl Strang

Coming into 2017, I had found seaside grasshoppers (Trimerotropis maritima) in most of the counties bordering Lake Michigan in the Chicago region. This band-winged grasshopper is mainly a beach-dwelling species, though it also occurs at Burnham Prairie, an inland site in Cook County

Seaside grasshopper, Indiana Dunes. This individual belongs to a population living on fine grained quartz sand.

The hind wings are bright yellow, and males can rattle their wings loudly in flight

Seaside grasshopper, Illinois Beach State Park. This one lives on a substrate of mixed fine stones ground by glaciers and waves. Selective pressures clearly have been at work on these hoppers.

Prior to this year I had found the species in Berrien, Porter, Lake (Indiana), Cook, and Lake (Illinois) Counties. In 2017 I added LaPorte County, and went up to Cliffside Park in Racine County, where GoogleEarth showed a narrow line of dunes and beach. I found, though, that storms and a risen lake level had removed these

The edge of Lake Michigan at Cliffside Park, looking north. Waves now wash right up to the cliff base.

Looking south from the same position.

I thought that might mean the end of the search, but a new GoogleEarth survey showed parks in the cities of Racine and Kenosha that looked promising. Both proved to have seaside grasshoppers, so now with the addition of Racine and Kenosha Counties I regard the Chicago region map complete for the species. I remain open, however, to stumbling across seaside grasshoppers at additional inland sites.

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