12 Mr. F. P. Pascoe's Descriptions of New Genera II. On New Genera and Species of Longicorn Coleoptera. Part IV. By Francis P. Pascoe, Esq., F.L.S., &c. As descriptions of many of Mr. Wallace's Aru Longicorns are contained in the present Part, it may be, perhaps, interesting to make a few remarks on his general collection of Coleoptera from that island, including the adjacent one of Key. The first glance at once showed a complete dissimilarity of forms to those we are accustomed to see from Australia : group after group marked its Indian island character, and it was only after a close inspection that here and there an Australian form might be noticed. Premising that I have only attempted a very slight sketch, as there were too many unpublished forms to allow of going into many details, I commence with the Cicindelklce. This family was represented by Tricondyla, and Thcrates, no true Cicmdela being present. Carabidce were few in number, and belonged chiefly to Lehia and its allies. Staplnjlinidce were also few, and not re-markable. Nothing has struck me so much in all Mr. Wallace's "island" collections as the paucity of Lamcllicornes. Tiiere are generally a few individuals of the cosmopolite Onihophagus and Oryctes, and perhaps some eight or ten Ccton'iadce, but rarely more than two or three examples of each. Anoplognathus, Phyllolocus, Di-p/nicephala, Liparclrus, and other common Australian genera of this order, are wholly wanting. Of the Malacoderms there were upwards of forty species., all rather small, and none particularly striking. The Cleridce were entirely represented by Stigmatntm and Oinmaditts, genera very abundant in the Indian Archipelago. Three or four species of Chrysodema, gems even amongst the Biipreslidee, Melanophila, Agrilus, Trachys, and one Milnbasis, comprised the whole of the family from Aru ; not a single Casl'ia-r'lna, or any of its allies, so common in the very poorest Austra-lian collections. Elateridce were fairly represented, and had two or three curious forms among them. The nimnber of Melasomes appears to be very limited in the Indian islands ; the Aru collection contained two or three obscure species of Opnlnim, and few of the other Heternmera were common. Mordtlla, the most abundant genus, had six species ; and of
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