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Calosoma calidum

Calosoma calidum
Hitchcock Nature Center, Pottawattamie County, Iowa, USA
April 29, 2007
Size: about 1.5 inches

Images of this individual: tag all
Calosoma calidum Beetle - Calosoma calidum

Moved from Calosoma.

Calosoma calidum
The very prominent bright golden elytral spots favor Calosoma calidum. Spots are smaller and shift to other shades in Calosoma frigidum. Incidentally, some current taxonomists - European mostly - move C. calidum to Callisthenes calidus.

Yes, I think you're right to go with calidum. I've looked at the pronotum several times and I'm just not seeing the lateral raised bead of the pronotum that should be "sharply defined inwardly for its entire length" for sayi. (Ciegler, Ground Beetles of South Carolina) Even in this photo, I imagine it should be easily visible. Good call on calidum.

Black Caterpillar Hunter
I believe this is a Calosoma sayi, the Black Caterpillar Hunter, but Calosoma calidum is a very similar species. Given the size estimate, I would lean towards C. sayi, but a Coleoptera expert might want to weigh in on this one to confirm.

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