Stages

Giant Mesquite Bugs are fascinating critters. Check out Margarethe Brummermann's great post on their life cycle. 

Photos by Marty Horowitz 5/26/2016

This one's crawling out of his/her old skin. Note the wing buds - not yet fully developed wings. Because we know that, in the insect world, adults have wings; we can say with certainty that this one isn't yet an adult.

Two stages clearly shown here. Neither is an adult, but the one at the bottom is older than the one at the top.