metallic green ground beetle larger
February 9, 2010
It was found in Midewin National Tallgrass Prairie in Wilmington, Illinois. Just thought it was neat. It is laying next to a ruler with centimeters. Thanks!
WE believe this is a Caterpillar Hunter in the genus Calosoma, possibly Calosoma sycophanta, a European species that was introduced to help control the invasive exotic Gypsy Moth. BioLib has numerous photos for comparison. We wrote to Eric Eaton for his opinion.
Sorry, I disagree. It is not even in the Calosoma genus. Something much smaller, but I don’t recognize it. Carabidae are pretty tough, for me anyway.
Update: January 2, 2017
Thanks to a comment, we believe this may be Agonum cupripenne which is pictured on BugGuide.