1st saw this spider in my backyard, Glendale, AZ July 14, 2015. I have lived in Tucson and Phoenix area all my life since 1947, and never seen one like it. Went online and asked spider experts what it was. It is an orb weaver - Family = arancida; Genus = argtopa trifosciata; Species = unknown. Mine is lime green body, with striped legs, about 50 cent piece size around the legs. It is non-poisonous.