Unknown Black Killer Bug
We have found several of these bugs in our yard. No one knows what they are, and we can’t find them on the internet. We have witnessed one of these bugs bite a earthworm in half. We see them chase the earthworms out of the ground, and attack them. They are pretty fast. We live in Spokane, WA. We hope you can tell us what it is. Thank you very much for your time.
This is a larva of a Ground Beetle in the family Carabidae. We suspect it is a Caterpillar Hunter, Calosoma scrutator.