(*Footnote. Memoires de l'Academie Imp. des Sciences etc. page 479.)
Guerin* has shown that the Arnidius marginatus Leach of the letter-press to the Voyage de l'Astrolabe, page 33, is synonymous with Carenum cyaneum of Bonelli, as he has seen the two specimens, the former of which is in Dupont's collection.
(*Footnote. Crust. Arachn. et Ins. of the voyage of the Coquille avant-propos page 7.)
M. Brulle* observes well that the Carenum cyaneum of Bonelli must be different from the Scarites cyaneus of Fabricius, as both these authors speak of its being blue (or deep blackish green) over the whole upper surface, while in the C. cyaneum the blue is confined to the margin of the elytra; besides Olivier expressly states that the Scarites cyaneus is smaller than the Scarites subterraneus, which will not at all suit the original specimen from which the learned Bonelli derived his generic character. In the British Museum is the original specimen of Arnidius marginatus (catalogued by Dr. Leach) presented by J. Huey, Esquire, and it is very different both in size and in colour from the descriptions of Fabricius and Olivier, and the figure of the latter,** all derived from the original specimen formerly contained in the Banksian collection. Dr. Boisduval's concise description (op. cit. page 2, page 23) answers the specimen so named by Leach.
(*Footnote. Histoire Naturelle des Ins. par Messieurs Audouin and Brulle 5 page 64.)
(**Footnote. Coleopt. 3 Number 36 l. 2 f. 17.)
If the figure of Carenum cyaneum, given by Audonin and Brulle in their Work (tome 5 plate 2 f. 6) be correctly drawn, it differs very considerably from Leach's specimens of Arnidius, which is a broader insect.
I have not been able to see the original specimen of the Scarites cyaneus, so that in all probability it has been destroyed; it is much to be desired that accurate figures and descriptions were made and published of the original specimens described by Linnaeus and Fabricius, which exist in the Banksian and Smithian Cabinets in the possession of the Linnean Society, as well as those to be found in the Hunterian and British Museums. The genus Eutoma of Newman* seems to me to be synonymous with Carenum, but different from Arnidius of Leach.
(*Footnote. Entomological Magazine 5 page 170 Eu. tinctilatus.)
CHLAENIUS, Bon.