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.

Mentum semicirculare antice rotundatum margine antico emarginato.

Caput porrectum oculis prominentibus thorace haud angustius.  Thorax convexus antice posticeque marginatus lateribus rotundatis haud marginatis.  Scutellum triangulare subacutum.  Abdomen thorace fere duplo latius.  Elytra humeris eminentibus marginatis, lateribus parallelis.  Pedes pentameri articulis tribus tarsorom primis ciliatis pulvillatis dilatatis, penultimo bilobo, ultimo tenui biunguiculato.  Femora postica valde incrassata intus unidentata.  Tibiae posticae compressae apice dilatatae angulo externo acuto.

Obs.  The structure of the tarsus in this genus, so near in affinity to Carpophagus and Sagra, has led me to investigate more minutely the tarsus in the tetramerous and trimerous insects of the French entomologists, and the result has been that the arrangement given in the third volume of M. Cuvier’s Regne Animal, is discovered to be as erroneous in point of description, as it is inconsistent with natural affinities.