The paper dealt with fifty-two species of butterflies and nineteen of beetles, the type-specimens of which had been discovered by the author in a collection purchased by the University of Edinburgh from M. Dufresne of Paris in the year 1819, and afterwards transferred to the Museum of Science and Art. In the case of the butterflies, the species referred to were described by Godart in the Encyclopédie Méthodique, while the beetles belonged to species described by Olivier in the same work, and also in his Histoire Naturelle des Insectes—Coléoptères, published about the same time. By the comparison of these original specimens with others in the Natural History Collections at the British Museum the author has been enabled to clear up many points in synonymy, etc., which have for nearly eighty years remained doubtful and obscure. The most important results of the investigations may be summarised as follows:—One of the beetles has been found by Mr Gahan, of the British Museum, to be the type of a new genus, which is characterised in the present paper, while the specimen upon which it is founded is probably unique; it has been found necessary to rename one species of butterfly and one beetle; errors in synonymy have been corrected in the case of nineteen species; and eight species hitherto wrongly placed have been referred to their proper genera.