Genus Molorchus Fabricius

Molorchus Fabricius, 1792, Ent. Syst., 1, 2 : 366 (type-species : Necydalus minor Linn. - Thomson, 1864, designation) loc. cit. - Gahan, 1906b, Fauna British India, Col. 1 : 169. -  Gressitt, 1951c, Longicornia 2 : 169. - Gressitt & Rondon, 1970, Pac. Ins. Monogr., 24 : 109.

Diagnostic characters : maxillary palpi a little longer than labial, both very conspicuous; prothorax longer than broad, base constricted and to a less degree at apex; fore coxal cavity open posteriorly; antennae much longer than body in , shorter in ; elytra abbreviated, rounded at apex; abdominal segments subequal; first hind tarsal segment longer than 2 + 3 united.

Molorchus songensis sp. nov. 

Body very small; head brownish castaneous; labrum, labial and maxillary palpi testaceous brown; scape glossy flavotestaceous, endoapical tip fulvescent; remaining antennal segments fuscous, segment 3 - 5 with sparse tawny bristles, 6 - 11 with dense ochraceous pubescence; pronotum, elytra, ventral of pro-, meso- and metathorax fuscous with sparse whitish pubescence; base of first abdominal segment and all abdominal suture luteous, the rest fuscous; all femora and tibiae ferrugineous with tawny bristles; all tarsal segments testaceous except first hind tarsal segment that is fuscous.

Head short, vertical in front; ventral horizontal, triangular when view from side, most of mandible concealed under labrum and clypeus making the anterior transversely truncated; maxillary and labial palpi conspicuous; labrum., setose; anterior margin of gula transverse, rectilinear; frons flat with a short transverse sulcus between gena, closely punctate; antennal insertion far from mandible, widely separated, as wide as external genal margin; antennifer feebly raised; canthus obsolete or absent; neck short. Antenna shorter than body in , not reaching apex of second abdominal segment; scape linear, impunctulate; segment 3 & 4 subequal, little longer than scape, filiform; 5 as long as scape; 6 - 11 decreasing in length, feebly produced laterally. Prothorax 2 X as long as wide; swollen; entirely granulate and hispid; constricted at base, feebly at apex; side unarmed, subparallel at apex, incurved at 1/3 from base; when view from side, latero-anterior margin reclinate, latero-posterior margin proclinate; disc flatten in front, abruptly bent at 1/3 from base; anterior margin of prosternum strongly convex; intercoxal process obsolete. Elytron abbreviated; short, extended to posterior margin of metasternum; side parallel, only gradually rounded at apex; disc dented behind middle, cloasely punctulate and piliferous. Membranous wing not extended beyond apex, leaving last two abdominal segments exposed. Abdomen slender, as long as head and thorax combined. Legs : fore coxae conical, contigous, projecting above prosternum; femora subfusiform, slightly pedunculate at base, with sparse bristles; hind femora only extended to second abdominal segment; hind tibiae asperated, with dense long bristles, apical spine shorter than first hind tarsal segment; the latter 2 X as long as 2 + 3 united.

Holotype (UNIMAS Coll.) [558] Song, Kapit Div., 8.XII.1994, Bakun expedition member. Length 6.2 mm; breadth 1.1 mm.

Distribution : Sarawak

Known habitat : playing ground beside a riverine town, facing a secondary forest.

Note : this species is placed under the genus Molorchus Fabricius as it fit the nominative generic description except for the non-tuberculate prothorax. It did not belong to the genus Epania Pascoe due to the fore coxal cavity that open posteriorly, very slender abdomen and for not having the strongly reticulo-puinctate prothorax.