These two images are for Bill (gpa bill) who kept reminding me to post them. At the Boyce Thompson Arboretum in Superior, Arizona, these amazing beetles are not often seen in a swarming group. Thanks for the tip to Mark, Bill and others that yes, I should really go back down the trail to see these beetles. I must admit that it was soooo hot I considering a pass on the sight. But I went along anyway. My Canon 5D Mark II was very very hot and I'd taken so many photos so quickly that it just was not wanting to focus as I needed and the heat made the camera hesitate between shots.
The next image shows a close view of the antennae for just one beetle. Great "resonator" design for this nature marvel.