......strolling across the garage floor! He (I'm guessing he) was strutting along like he owned the place, red legs and all. He is a red-legged purseweb spider (sphodros rufipes). According to Wikipedia these are native to the Southeast US but have been spotted much further North. They make a tunnel shaped web and rarely leave it except to mate. No wonder he looked so preoccupied. Also, notice his pet ant walking along.