[[p. 355]] This small collection comprises forty-six species of diurnal, and ninety-three of nocturnal Lepidoptera, and bears internal evidence of having been chiefly formed in a cultivated district. It cannot, therefore, be taken as furnishing any adequate idea of the productions of the island of Formosa in this order of insects. The large majority of the species are those which are widely spread over the Eastern Tropics, and they generally present no striking differences from specimens collected in India or the Malay islands. There are not wanting indications, however, that a rich harvest of these beautiful insects could be obtained in the forests of the interior; for the only two [[p. 356]] species which occur in the collection belonging to the forest-haunting genera Euplœa and Pontia appear to be quite distinct from any yet described. There is also a Pieris which exhibits sufficient departure from the allied Indian and Malayan forms to deserve a separate specific name, and a small Lycæna which seems quite new. It is probable that at least four times as many species as are here given exist in Formosa; and it is to be hoped that Mr. Swinhoe may yet have an opportunity of continuing his researches. Some notes on the habits of the various species sent by the gentleman have been incorporated in the accompanying list; and the five new species of Butterflies which the collection contains have been described as a first instalment towards the insect-fauna of a new and most promising region. The new species are Pontia niobe, Pieris formosana, Terias vagans, Euplœa swinhoei, and Lycæna nisa. Mr. Frederic Moore, who has paid much attention to the nocturnal Lepidoptera (Heterocera), has furnished the list of that part of the collection, in which, however, it has not yet been possible to determine all the obscurer species.