Lambanus, Pace, 2014

Pace, R., 2014, Aleocharinae from Sabah (Borneo) collected by Guillaume de Rougemont (Coleoptera, Staphylinidae), Linzer biologische Beiträge 46 (1), pp. 727-794 : 751

Lambanus nov.gen. ( Figs 36 and 150-158 )

D i a g n o s i s: The antennae inserted behind the anterior level of the eyes separates this new genus from the similar genera Diplopleurus BERNHAUER, 1915 and Drusilla LEACH, 1819 which both have similar pronota and mouthparts. The new genus is also distinguished by the characteristic form of the seventh abdominal segment ( Fig. 154 ), with strongly curved lateral portions which may have a prehensile function during the copulation. The new genus also differs from Diplopleurus and Drusilla in the dilated third article of the maxillary palpi and in the form of the spermatheca.

D e s c r i p t i o n: In facies very similar to Deroleptus BERNHAUER, 1915 ( Fig. 36 ). Temples bordered below. Head narrow, neck broad. Gular sutures parallel. Antennae inserted behind the anterior level of the eyes. Mandibles short. Maxillary palpi ( Fig. 150 ), with the 1 st joint small, 2 nd slightly curved and slightly thickened towards apex, 3 rd thicker than the 2 nd, 4 th subulate, half as long as the 3 rd. Outer lobe of maxilla rather narrow, extending beyond the apex of the inner lobe, ciliate at apex ; inner lobe narrow, pointed, with several fine curved spines below the apex, ciliate elsewhere. Mentum transverse, the sides rounded and dilated behind, narrowed towards the front, the anterior margin almost truncate. Labial palpi short, 3-jointed ( Fig. 155 ), the 1 st joint short, 2 nd longer and narrower. Tongue short and broad, subtriangular, scarcely as long as the 1 st joint of the labial palpi, with a narrow triangular excision reaching nearly to the base and dividing it into two triangular lobes with apical spines. Paraglossae feeble, extending to the base of the 1 st joint of the labial palpi. Mentum: Fig. 156 . Mesosternal process broad, truncate behind, extending about half the length of the coxae, metasternal process broad and truncate, meeting the mesosternal process, the coxae widely separated. Elytra not emarginate posterolaterally. Abdomen more or less navicular, only the 1 st visible segment transversely impressed at the base. Legs moderate. Tibiae ciliate. Tarsal formula: 4, 5, 5, the metatarsus with the 1 st joint moderately long, a little longer than the 2 nd, 3 rd and 4th together. Seventh abdominal segment ( Fig. 154 ), with strongly curved lateral portions, which may have a prehensile function during the copulation.

T y p u s g e n e r i s Lambanus borneensis nov.sp.

E t y m o l o g y: The masculine name of the new genus derives from the ancient Greek λαμβάνω = to take.

Figures

Figs 34-45: Habitus. (34): Orphnebius concavus nov.sp., scale bar 3.4 mm; (35): Orphnebius parabigladiosus nov.sp., scale bar 3.9 mm; (36): Lambanus borneensis nov.sp., scale bar 6 mm; (37): Lambanus rougemonti nov.sp., scale bar 7.1 mm; (38): Drusilla divergens nov.sp., scale bar 7.1 mm; (39): Drusilla bulbosa nov.sp., scale bar 4.6 mm; (40): Drusilla serrulae nov.sp., scale bar 4.6 mm; (41): Drusilla borneoacuta nov.sp., scale bar 6.9 mm; (42): Drusilla caputserpentis nov.sp., scale bar 7.1 mm; (43): Drusilla bilobata nov.sp., scale bar 5 mm; (44): Drusilla sabahensis nov.sp., scale bar 3.9 mm; (45): Drusilla profunda nov.sp., scale bar 3.9 mm.

Figs 146-156: Aedeagus in lateral and ventral view, maxilla with maxillary palpus, sixth free urotergum of male, abdominal segment IX of male or female, labium with labial palpus, mentum. (146-147): Orphnebius concavus nov.sp.; (148-149): Orphnebius parabigladiosus nov.sp.; (150- 156): Lambanus borneensis nov.gen., nov.sp. Scale bars: 0.1 mm.

Figs 157-168: spermatheca, sixth free urotergum of female (158) and male (167), aedeagus in lateral and ventral view. (157-158): Lambanus rougemonti nov.gen., nov.sp.; (159-160): Drusilla sculpticollis PACE; (161): Drusilla bruneiorum PACE; (162-163): Drusilla divergens nov.sp.; (164- 168): Drusilla bulbosa nov.sp. Scale bars: 0.1 mm.