Baeocera bifurcilla, Lobl, 2015

Löbl, Ivan, 2015, On the Scaphidiinae (Coleoptera: Staphylinidae) of the Lesser Sunda Islands, Revue suisse de Zoologie 122 (1), pp. 75-120 : 87-89

Baeocera bifurcilla sp. nov.

Figs 40-45

Holotype: MHNG; ♂; Indonesia, Bali Yehbuah (N of Yehembang, E of Mendaya), 250 m D. Agosti 25.4.1991.

Paratypes: MHNG; 11 ♂, 12 ♀; Indonesia, Bali Badingkayu, 300-500 m 10.-14.XI.1991, I. Löbl forest floor litter, bark.

Etymology: The species epithet is a Latin noun, meaning small fork and referring to the shape of the parameres.

Description: Length 1.06-1.21 mm, width 0.72- 0.80 mm. Body strongly convex, without obvious microsculpture. Head, body and femora reddish-brown, tibiae slightly lighter, tarsi and antennae yellowish. Length/width ratio of antennomeres as follows: III 20/7: IV 16/7: V 22/7: VI 18/7: VII 30/8: VIII 16/7: IX 30/11: X 28/14: XI 32/14. Lateral contours of pronotum and elytra separately arcuate. Pronotum with hardly visible punctation and setation (100x magnification), lateral margins convex, anterior margin broad, basal lobe small; lateral pronotal carinae concealed in dorsal view. Minute tip of scutellum exposed. Elytra weakly narrowed apically, not covering abdominal apex, lateral margin carinae hardly visible in dorsal view, sutural striae curved at bases to form basal striae abruptly ending about at mid-width of elytra; adsutural areas flat, parallel in anterior two thirds, impunctate. Elytral punctation very fine along sutural striae, evanescent along bases, on humeral areas and on apical third to two fifth. Punctation coarse and dense on remaining discal surface, with punctures well delimited, about half as large to as large as puncture intervals. Epipleural striae entire, punctate, supraepipleural areas impunctate. Hind wings well developed. Hypomera impunctate, smooth. Mesoventral suture indistinct, mesoventrite distinctly punctate, without median ridge. Mesepimera about 3 times as long as wide and 3 times as interval to metacoxae. Median part of metaventrite convex, with small smooth area in centre delimited laterally and posteriad by coarse punctation. Lateral parts of metaventrite coarsely punctate, except on narrow smooth areas along metacoxae; punctures round or slightly elongate, puncture intervals usually smaller than puncture diameters. Submesocoxal lines parallel, with marginal punctures not extending laterally, submesocoxal areas about 0.02 mm long, about as fourth of interval to metacoxae. Metanepisternal suture indicated by impressed outer row of coarse punctures. Tibiae straight. Sternite 1 with coarse basal punctures, separated by wrinkles up to about 0.05 mm long, uninterrupted in middle; punctation posterior basal puncture row distinct in middle, very fine laterally.

Male: Protarsomeres hardly widened. Aedeagus (Figs 40-44) 0.32-0.37 mm long. Median lobe and parameres symmetrical, moderately sclerotized. Basal bulb of median lobe longer than apical process, latter inflexed, tapering, with blunt tip and concave ventral side. Articular process indistinct. Parameres long, extending fairly beyond tip of median lobe, straight in dorsal view, narrowed at level of tip of median lobe, arcuate in basal half and straight in apical half with slightly widened apical part in lateral view. Internal sac with complex basal sclerites forming arcuate flagellum and apically widened guide-sclerite joined to laterally expanded base. Basal section of ejaculatory duct distinct. Membranes with extremely finely tubercle-like structures at base and around apex of guide-sclerites.

Female: Ovipositor (Fig. 45) with long distal gonocoxite strongly narrowed toward apical half, narrow and parallel-sided in long apical section, bearing single long apical seta, gonostyle absent.

Distribution: Indonesia: Bali.

Type locality: Bali, Yehbuah (N of Yehembang, E of Mendaya), 250 m.

Comments: This species is a member of the B. lenta group. Its aedeagal characters suggest close relationship with B. bifurcata . It may be easily distinguished by the shape of the parameres as seen in lateral view, the shorter apical section of the parameres, the shape of the flagellar guide-sclerite, and in external characters by the coarse elytral punctation abruptly ending before apical third of the disc.