The longicorn beetles from their number, variety, size, and the damage they do to timber and plants, are well known beetles, and have always been a favourite group with collectors. They are usually elongate in form, with powerful gnawing jaws, and long slender many-jointed antennae standing out in front of the head, the basal joint often half encircled by the large compound eye; the elytron is always divided down the centre, and the large hind wings well adapted for flight are folded beneath them; the legs are strongly developed, well adapted either for running about or clinging to their food plant. They deposit their eggs in bark or timber; the larvae burrow into the tissue beneath, upon which they feed; they often remain, long cylindrical or flattened naked grubs, for several years before they pupate in the end of their last gallery. They are divided into three large sub-families by modern entomologists; our species have been chiefly described by Newman in “The Entomologist” 1842; “Annals of Natural History” 1840; and a number of other Journals. Pascoe contributed a great many papers to over half a dozen of the leading entomological societies in England between 1857 and 1875. Hope, in the Proceedings of the Entomological Society of London 1841, and other Transactions, added largely to our list, while Messrs. Boisduval, Germer, White, Saunders, and others described odd specimens. In our own Journals, Macleay and Blackburn have also dealt with these beetles. The PRIONINAE comprise a number of large broad thickset beetles with the front coxae large and transverse, and the prothorax having well developed side margins. The determination of several of our commonest species was a matter of some doubt, so I submitted most of our common forms to Professor Lamare of Brussels, who has identified them and enabled me to speak with some authority.