This is a leaf-footed bug; there's a whole Family of these critters, so I'll 'leaf' the i.d. to the experts. Drop me a line if you know the name of this beast. Update: Thanks to Fred, who looked this up: Acanthocephala thomasi. Let's just call him Thomas.
Another photo by Ned Harris, 10/18/11 c. 10.30am
Click on this one for a close up of the moon over the Santa Catalinas, between stops 8 and 9.