I am not sure what kind of beetle this is.....
Sonoran Desert, outside of Tucson, AZ.
AKA: Peucetia Viridans
These spiders live on plants, espeically the Prickly Pear Cactus. They grow up to 3/4" in length, are light green in color, and have spiny legs.....
I don't have a clue to which family this crawler exactly belongs but I'd say it's probably part of the 'Insectus Gigantus Horribilis'-clan.