Saw this scary looking bug while picking lima beans yesterday. Called a wheel bug and is around 1.5" long. It is a beneficial insect that feeds on other insects by grabbing them with its front legs, piercing the body and injecting saliva that paralyzes and then liquefies the insides of prey. Suck the insides out and start looking for the next victim.
They aren't aggressive to humans, but if you disturb them too much, they can inflict a painful "bite" that can hurt for days, cause numbness around the bite area and take days to weeks to fully heal.
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A side note on insect classification. These are a member of a group called "true bugs" from the order H
emiptera. True bugs have piercing sucking mouthparts and incomplete metamorphosis (egg, nymph, adult) with no larval stage. Common example is the group of "stink bugs" or squash bugs.
When I was teaching entomology to Master Gardeners, I would use the line that "All bugs are insects, but not all insects are bugs". Meaning that in the entomology world calling something a bug refers to specific groups within the order
Hemiptera, and it is incorrect to refer to most insects as bugs.