The Croton setigerus (Dove Weed, Turkey Mullein) is currently blooming at the Claremont Colleges' Robert J. Bernard Biological Field Station, so I have been looking for interesting insects that might be visiting the flowers. On every plant I've looked at, I've seen tiny little insects that fly and seem to just disappear when they land. Today I watched them very carefully and saw that they were tiny pale grayish-green bugs that land on the leaves, where they are almost perfectly camouflaged. I have no idea what they are, and any information will be greatly appreciated!

Here's another individual: