3. Heteromera.—This group is represented by three peculiar genera containing four species, with two species belonging to European genera. They belong to the families Opatridæ, Mordellidæ, and Anthicidæ.
4. Brachyelytra.—Of this group there are six peculiar species belonging to four European genera—Homalota, Philonthus, Xantholinus, and Oxytelus.
5. Priocerata.—The families Elateridæ and Anobiidæ are each represented by a peculiar species of a European genus.
6. Phytophaga.—There are only three species of this tribe, belonging to the European genus Longitarsus.
7. Lamellicornis.—Here are three species belonging to two genera. One is a peculiar species of Trox, allied to South African forms; the other two belong to the peculiar genus Melissius, which Mr. Wollaston considers to be remotely allied to Australian insects.
8. Pseudo-trimera.—Here we have the fine lady-bird Chilomenus lunata, also found in Africa, but apparently indigenous in St. Helena; and a peculiar species of Euxestes, a genus only found elsewhere in Madeira.
9. Trichopterygidæ.—These, the minutest of beetles, are represented by one species of the European and Madeiran genus Ptinella.
10. Necrophaga.—One indigenous species of Cryptophaga inhabits St. Helena, and this is said to be very closely allied to a Cape species.
Peculiarities and Origin of the Coleoptera of St. Helena.—We see that the great mass of the indigenous species are not only peculiar to the island, but so isolated in their characters as to show no close affinity with any existing insects; while a small number (about one-third of the whole) have some relations, though often very remote, with species now inhabiting Europe, Madeira, or South Africa. These facts clearly point to the very great antiquity of the insect fauna of St. Helena, which has allowed
time for the modification of the originally introduced species, and their special adaptation to the conditions prevailing in this remote island. This antiquity is also shown by the remarkable specific modification of a few types. Thus the whole of the Cossonidæ may be referred to three types, one species only (Hexacoptus ferrugineus) being allied to the European Cossonidæ though forming a distinct genus; a group of three genera and seven species remotely allied to the Stenoscelis hylastoides, which occurs also at the Cape; while a group of twelve genera with forty-six species have their only (remote) allies in a few insects widely scattered in South Africa, New Zealand, Europe, and the Atlantic Islands. In like manner, eleven species of Bembidium form a group by themselves; and the Heteromera form two groups, one consisting of three genera and species of Opatridæ allied to a type found in Madeira, the other, Anthicodes, altogether peculiar.