Drusilla bulbosa, Pace, 2014

Pace, R., 2014, Aleocharinae from Sabah (Borneo) collected by Guillaume de Rougemont (Coleoptera, Staphylinidae), Linzer biologische Beiträge 46 (1), pp. 727-794 : 754

Drusilla bulbosa nov.sp. ( Figs 39 and 164-168 )

T y p e m a t e r i a l Holotype, Sabah, Danum Valley, B.R.L., f.i.t., 14-16.II.2007, G. de Rougemont leg. (CROU). Paratype: 1, same provenance as the holotype (CROU).

D e s c r i p t i o n: Length 4.4-4.69 mm. Body and pronotum slightly shiny, rest of the body shiny. Body black, elytra and abdomen blackish-brown, pygidium reddish, antennae reddish with basal antennomere reddish-brown, the second, third and three apical antennomeres and legs yellowish-red. Second antennomere shorter than the first, third longer than the second, fourth to tenth longer that wide. Eyes as long as the postocular region in dorsal view. Reticulation of head and pronotum strong, that of the elytra evident, that of the abdomen very transverse and evident. Puncturation of the head fairly dense and superficial, that of the pronotum evident and fairly close, with four large discal punctures disposed in a rectangle rectangle; puncturation of the elytra strong and very superficial, that of the abdomen very fine, superficial and sparse. The deep median sulcus of the pronotum does not reach the anterior margin and posterioriorly it ends in a shallow dimple. Male and female sixth free abdominal tergites with a wide median lobe on the posterior margin ( Fig. 167 ). Male first free tergite with two long narrow appendices directed posteriorly ( Fig. 168 ). Male fifth free tergite with a salient posterior median carina ( Fig. 168 ). Aedeagus: Figs 164-165 ; spermatheca: Fig. 166.

C o m p a r a t i v e n o t e s: In its habitus and the form of the spermatheca, the new species is similar to D. foeda PACE, 2008 also from Borneo. It differs in the fourth antennomere being longer than wide (as long as wide in D. foeda ), and in the distal bulb of the spermatheca which is narrower (0.04 mm), than the proximal bulb (0.1 mm is wide), whereas in D. foeda the distal bulb of the spermatheca is 0.1 mm wide and a little narrower than the proximal bulb (0.11 mm wide).

E t y m o l o g y: The name of this new species refers to the large proximal bulb of the spermatheca.

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 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.