(1) A factor contracting on his own credit;
(2) Where promissory notes or other evidences of debt are made payable to an agent of a corporation;
(3) In all cases where the contract is made with the agent in his individual name, though his agency be known;
(4) Auctioneers may sue in their own names for goods sold by them;
(5) In cases of agency coupled with an interest in the agent, known to the party contracting with him.