(Belleville, IL)  —  A Missouri man is accused of trying to have sex with a 13-year-old boy.  Samuel Barney was arrested last night by St. Louis County police, five days after Belleville police issued a warrant for his arrest.  Authorities say Barney exposed himself to the boy and tried to seduce him with an electronic device.  He also allegedly traveled to Illinois twice with the intent of having sex with the teen.