Gen. ORYSSUS, _Fabr._ 1. ORYSSUS MACULIPENNIS. _O._ niger, punctatus; pedibus ferrugineis; alis fuscis fascia hyalina ante cellulam marginalem sita. _Female._ Length 5-1/2 lines. Black; the head rugose, the front coarsely so, with a row of transverse tubercles running from the vertex along the inner orbits of the eyes, and crossing the front at half their length; the cheeks with a cinereous down, and a line of silvery-white pubescence or down, along the outer orbits of the eyes. Thorax coarsely punctured; the mesothorax with a central longitudinal smooth elevation; wings fuscous, with a broad transverse hyaline fascia before the base of the marginal cell, the tips of the wings hyaline; the legs ferruginous, with the coxae and trochanters black; the posterior tibiae with a double row of serrations outside. Abdomen shining and closely punctured; the base and apex coarsely so. _Hab._ Aru. Gen. XYPHIDRIA, _Latr._ 1. XYPHIDRIA RUFIPES. _X._ nigra; mandibulis, antennarum scapo, pedibusque ferrugineis; alis hyalinis et iridescentibus. _Female._ Length 4 lines. Black and shining; the vertex highly polished; the front from the posterior ocelli forwards closely punctured and opake; the mandibles, scape, and basal joint of the flagellum ferruginous. The thorax anteriorly punctured and opake, posteriorly shining, and with a few punctures at the base of the scutellum; wings hyaline and iridescent, the nervures black, the extreme base of the wings and the tegulae pale testaceous; the legs pale ferruginous, with the claws of the tarsi darker. Abdomen: the base of the segments depressed and very delicately and closely punctured, subopake; the apical half highly polished and shining; beneath obscurely rufo-piceous. _Hab._ Aru. Gen. TREMEX, _Jurine_. 1. TREMEX INSIGNIS. _T._ nigro-purpureus; abdominis fasciis basalibus albis; alis nigris cupreo nitentibus. _Female._ Length 11 lines. Obscure steel-blue, with shades of green, purple and violet; the head and thorax punctured; the prothorax with an oblique smooth shining space on each side; the wings very dark brown, with a brilliant coppery effulgence. The base of the abdomen opake, velvety, purple-black; the first segment with a transverse cream-coloured fascia in the middle, the second very slightly whitish at its base; the rest of the abdomen is highly polished, and has a scattered, short, black pubescence. _Hab._ Aru. Note on Two Insect-products from Persia. By DANIEL HANBURY, Esq., F.L.S. [Read December 16th, 1858.] In the month of June last, my friend Professor Guibourt, of Paris, laid before the Academie des Sciences[G] some account of a remarkable substance called _Trehala_, the cocoon of a Curculionidous insect found in Persia, where, as well as in other parts of the East, it enjoys some celebrity as the basis of a mucilaginous drink administered to the sick.