(b) All expenses, including the compensation of officers and employees of the department made pursuant to any such contract, shall be paid in the first instance out of the state treasury on the certificate of the superintendent upon audit and warrant of the comptroller and shall be presented in the form of an itemized bill therefor to such insurance supervisory officials. The state treasury shall be reimbursed by payments thereto by the superintendent of amounts collected by him in accordance with the provisions of this section.