Palpi maxillares breves crassi vix ultra maxillarum apicem extensi, quadriarticulati articulo stipitali vix conspicuo secundo obconico tertio subgloboso breviori ultimo ovali obtuso. Palpi labiales triarticulati articulo stipitali minimo, secundo obconico longiore, ultimo crassiori ovato, apice truncato. Labium obcordatum basi corneum angustius apice membranaceum medio emarginatum ciliatum lobo utrinque rotundato. Mentum semicirculare antice rotundatum medio emarginato sive edentulo. Caput porrectum oculis prominulis thorace angustiua clypeo quadrato vertice inter oculos fossulis duabus antice convergentibus. Thorax haud marginatus lateribus haud rotundatis subcylindricus antice angustius, postice sublobatus. Scutellum tuberculare mucronatum. Abdomen thorace duplo latius. Elytra convexa humeris eminentibus postice divergentia rotundata. Pedes pentameri articulis tribus tarsorum primis ciliatis pulvillatis dilatatis, tertio bilobo, quarto brevissimo et quinto tenuibus obconicis, hoc biunguiculato. Femora postica valde incrassata intus unidentata; dente magno. Tibiae posticae compressae apice dilatatae. 73. Megamerus kingii (n.s.) M. nigro-fuscus labro palpisque piceis thorace vix punctato postice rugoso, elytris rugis vel punctis confluentibus substriatis fossula ad humeros profunda lineaque suturali impressis, corpore subtus pilis sub-sericeo pedibusque concoloribus. Table B. figure 2. Obs. This singular insect has an affinity to Sagra, but differs from that genus in having setiform antennae, porrect mandibles, and securiform palpi. Its habit is also totally different from that of a Sagra, and more like that of some of those insects which belong to the heterogeneous magazine called Prionus. It is, undoubtedly, the most singular and novel form in Captain King's collection, and forms a new genus, of which the characters are as follow. MEGAMERUS (novum genus). Antennae inter oculos insertae filiformes vel potius setaceae articulo basilari crassiori secundo subgloboso brevissimo apicali acuto. Labrum transverso-quadratum antice submembranaceum tomentosum subemarginatum. Mandibulae exertae porrectae supra convexiusculae lunulatae vel falciformes dorso subsinuatae apice vel extus oblique truncatae acutissimae. Maxillae basi corneae processubus duobus submembranaceis apicem versus instructae, lobo externo vel apicali ovali extus ciliato, interno tenuiori apice subacuto margineque interno vix unidentato. Palpi maxillares quadriarticulati, articulo stipitali minimo inconspicuo, secundo obconico longo duobus ultimis simul sumptis longitudine fere aequali, tertio obconico crassiori, ultimo securiformi compressa. Palpi labiales triarticulati articulo stipitali minimo inconspicuo, secundo longo obconico setis quibusdam ad apicem instructo, tertio triangulari compresso vel securiformi. Labium membranaceum cordatam antice bilobum, lobis elongatis ciliatis interno latere rectilineari extus ad apicem rotundatis.