this is outside the offices for Alabaster State Park near Freedom,OKLA the beetle is dead and is serving food for the ants Pest Description All stink bugs are shaped like shield with only color and slight size variations between the green and brown species. The green species are 14 to 19 mm long and bright green colored. The main body parts are outline with orange-yellow margins. The barrel shaped, green eggs gradually change to gray and pink. The emerging young or the nymphs resemble adults in shape but are smaller sized. Green stink bugs are mostly black upon emergence and gradually turn green on maturity. Damage Stink bugs feed on the fruit on all fruit bearing plants by piercing the skin with their sharp, needle like mouths. The feeding is likely to transmit the yeast spot disease pathogen in infested plants. Heavy damage to fruit reduces yields. Though the pest host range includes more than 52 plants, the pests prefer wild plant species such as prickly pear. http://www.ehow.com/info_8739957_green-insects-prickly-pear-cactus.html