Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Fall Fund Drive

big green beetle - Calosoma scrutator

big green beetle - Calosoma scrutator
Ailsa Craig, Middlesex, Ontario, Canada
June 7, 2005
Size: about 25 mm
First seen under garage light, then it ran off and I had to chase it down the driveway in the dark. Size-wise, seems halfway between Calosoma wilcoxi (20 mm at CBIF; 18-26 mm in Guide) and C. scrutator (30 mm at CBIF; 25-35 mm in Guide). Comparison images here.

Images of this individual: tag all
big green beetle - Calosoma scrutator big green beetle - front - Calosoma scrutator

Moved from Calosoma.

Probably C. scrutator
Dillon & Dillon (1961) have C. wilcoxi as 16-20mm with the base of the pronotum narrower than the apex and C. scrutator as 25-30mm with pronotal base and apex approximately equal. I'd wager this is most likely scrutator.

base of pronotum
Thanks, Ethan. I know that the base of the elytra is the anterior portion, and the base of the head is the posterior portion... but is the base of the pronotum the anterior or posterior portion?

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.