A convicted felon is trading in his now infamous blue dinosaur onesie for an orange jumpsuit … because cops say he’s back in police custody in Nashville after a truly bizarre alleged crime spree.

Here’s the deal … cops say 23-year-old Elijah Samuel Morris is the burglary suspect they’ve been searching for since January, when he allegedly broke into a vehicle and burglarized a home — all while wearing a blue dinosaur onesie — and police say he was arrested Wednesday on separate charges.

Cops say they responded Wednesday morning to reports of vehicle burglaries in progress, and officers saw Morris in a car with 2, count ’em, 2 flat tires. Police say when they hit the sirens, Morris put the car in reverse and drove off before stopping in a parking lot and fleeing on foot.

Police say they tracked Morris down and saw him try to get into another vehicle … and cops allege he was in possession of a gun that had been reported stolen in Louisville when they made the arrest.

And, get this … cops say arson investigators from the Nashville Fire Department also identified Morris as the suspect who they believe started a fire outside a home back in December, and now he’s facing charges of aggravated arson.

Police say Morris is also charged with aggravated assault, theft of property, theft of a firearm, evading arrest, felony probation violation, possessing a firearm during the commission of a felony and felon in possession of a gun.