Serial bank robber is bald and proud of it

How else to explain this guy's apparent decision to rob a bank without covering up? Or maybe he normally wears a toupee, and this is his disguise.

In any case, the FB says thiss 5'10" to 6' Hispanic male with a shaved head, between 30 and 40, is wanted for robbing a Bank of America in Arlington on Dec. 8. He made his getaway in a green four-door sedan, possibly a Camry. He's also wanted for holding up the Harvard Credit Union in Cambridge on Dec. 2 (but with a knit cap on that time) and two banks in Brookline.

Know him? Contact the FBI Bank Robbery Task Force at 617-680-4525.