The Caddo Sheriff's Office is asking the public for help in locating a man wanted for financial crimes.  Deputies have obtained arrest warrants for 27-year-old Joseph R. Colvard III on forgery and bank fraud charges.  He's accused of forging royalty checks stolen from mailboxes in Keithville and then cashing them at a local bank.  Colvard is a white male, 5'9", 155 pounds, with brown hair and blue eyes.  He's known to drive an early '90s red Ford truck and his last known address is 7979 Holly Ridge Drive in Keithville.  Caddo detectives say Colvard has made threats against law enforcement in the past and should be considered armed and dangerous.  If you have any information about where he might be, you're asked to call Detective Bobby Herring at 675-2170 or Crime Stoppers at 672-7373.