And as if that sign weren't enough, someone with a red spray pencil had added THAT MEANS YOU, BUG! The stiff, black-shelled form, impaled on a spike beside the trafficway, with gummy beads of blue blood glistening in the sun, told the pretty little story much more graphically. It hadn't been decapitated; Martians lack external heads. Scat scanned the tableau, his scarred lean features impassive. "They didn't mention this," he commented. "Do we still go in?" "You ask questions like that just for