We have on our table, the"Proceedings of the Academy of Sciences of St. Louis, with Accounts of Various Entomological Discoveries, by Prof. Riley." There is an account of the larval habits of the Blister Beetles, about which nothing much has been known. Also a new beetle, very troublesome to bee-keepers. This has been dedicated to Philadelphia's distinguished entomologist, Dr. Horn, and is named Hornia minutipennis. Mr. Riley also defends himself from an attack on some of his statements about the yucca moth. There is no doubt but yucca is never fertilized or produces seed except by the aid of the yucca moth. Much of what appears in the papers in regard to the action of insects on flowers is pure speculation; but this discovery of Mr. Riley's is unquestionably true, and is the result of careful observation, and we class it as one of the great discoveries of the age. Those who undertake to dispute with Prof. Riley on this fact will undoubtedly get the worst of it, and we suspect the writer whom Riley has here paid his respects to is somewhat of this opinion by this time.