Ned recently sent this link to Margarethe's bug blog. This post is everything you ever wanted to know about Giant Mesquite Bugs (photo here by Matt Ball, but there are plenty of great photos by Ned and others on her blog). Carol and I spotted some on 'Ned's tree' (the one below the dam, where you are sure to see an ornate tree lizard or two).
Margarethe's post on Giant Mesquite bugs.
And check out her wonderful artwork, too!