Cetoniidæ.--These magnificent insects are but poorly represented in America; the species being mostly of sombre colours. There are 14 genera, 12 of which are peculiar. The most extensive genus is _Gymnetis_, which, with its allies _Cotinis_ and _Allorhina_, form a group which comprehends two-thirds of the Neotropical species of the family. The only other genera of importance are, _Inca_ (7 sp.), remarkable for their large size, and being the only American group in which horns are developed on the head; {17}and _Trigonopeltastes_ (6 sp.), allied to the European _Trichius_. The non-peculiar genera are, _Stethodesma_, of which half the species are African and half tropical American; and _Euphoria_, confined to America both North and South. Buprestidæ.--In this fine group the Neotropical region is tolerably rich, having examples of 39 genera, 18 of which are peculiar to it. Of these, the most extensive are _Conognatha_ and _Halecia_, which have a wide range over most parts of the region; and _Dactylozodes_, confined to the south temperate zone. Of important genera which range beyond the region, _Dicerca_ is mainly Nearctic and Palæarctic; _Cinyra_ has a species in North America and one in Australia; _Curis_ is divided between Chili and Australia; the Australian genus _Stigmodera_ has a species in Chili; _Polycesta_ has a species in Madagascar, two in the Mediterranean region, and a few in North America; _Acherusia_ is divided between Australia and Brazil; _Ptosima_ has one species in south temperate America, the rest widely scattered from North America to the Philippines; _Actenodes_ has a single species in North America and another in West Africa; _Colobogaster_ has two in West Africa, one in Java and one in the Moluccas. The relations of South America and Australia as indicated by these insects has already been sufficiently noticed under the latter region. Longicornia.--The Neotropical Longicorn Coleoptera are overwhelming in their numbers and variety, their singularity and their beauty. In the recent Catalogue of Gemminger and Harold, it is credited with 516 genera, 489 of which are peculiar to it; while it has only 5 genera in common (exclusively) with the Nearctic, and 4 (in the same way) with the Australian region. Only the more important genera can be here referred to, under the three great families into which these insects are divided. The Prionidæ are excessively numerous, being grouped in 64 genera, more than double the number possessed by any other region; and 61 of these are peculiar. The three, common to other regions, are, _Parandra_ and _Mallodon_, which are widely distributed; and _Ergates_, found also in California and Europe. The most remarkable genera are, the magnificently-coloured _Psalidognathus_ and _Pyrodes_; the large and strangely marked {18}_Macrodontia_; and _Titanus_, the largest insect of the entire family.