piece of shell, maybe killed by mower
By Foran Hall
Keyed to species using gobotany's Polygonum key: https://gobotany.newenglandwild.org/dkey/polygonum/
Heard it call "che-bik" a few times.
At least 8 individuals. Didn't see them perch, and they were too fast for in-flight photos.
Call note fit Louisiana better than Northern. Date is also rather early for Northern.
Found on a Solanum nigrum tending to aphids back in October. I stored in approx 59% ethanol which I think caused the gaster to swell.