The TEATRO VALLE is a very small, mean, and dirty theatre. It is, however, popular for its excellent comic operas, and for its comedies, which are humorous, and performed by actors, whose drollery, though of a broader cast than the fashion of France and England would permit, is not without frequent touches of nature, and shrewd insight into the philosophy of life. A charming actress, and exquisite singer, Monbelli, was the prima donna; and her most lady-like manners and perfect respectability made her the most popular professional singer in the salons of Rome. We heard her constantly at the Princess Borghese's Friday evening concerts, and always with unabated admiration.