Pseudacerus furcatus Raffray, 1895

Hlaváč, Peter, 2011, Contribution to the knowledge of the tribe Mastigerina (Coleoptera: Staphylinidae: Pselaphinae, Clavigeritae), with a description of a new genus from Borneo, Zootaxa 3070, pp. 51-59 : 53-54

Pseudacerus furcatus Raffray, 1895

( Figs. 1, 4, 6, 7 )

Pseudacerus furcatus Raffray, 1895: 81 .

Type material (233). Lectotype (here designated): MALAYSIA: 3, [h] Penang / [red label] [p] TYPE / [h] P. furcatus [p] A. Raffray det. / [p] MUSÉUM PARIS, 1917, COLL. A. RAFFRAY / [red label] [p] LECTOTYPE Pseudacerus furcatus Raffray, P. Hlaváč , des. 2008. ( MNHN). Paralectotype: MALAYSIA: 3, [h] Penang / [h] P. furcatus [p] A. Raffray det. / [p] MUSÉUM PARIS, 1917, COLL. A. RAFFRAY / [red label] [p] PARALECTO- TYPE Pseudacerus furcatus Raffray, P. Hlaváč , des. 2008. ( MNHN).

Description. Body ( Fig. 1 ) shiny reddish brown, antennae and legs yellowish brown, length about 1.35 mm, maximum width of elytra 0.78 mm.

Head widest at base, about 1.15 times as wide as long; space between eyes about 1.5 times as wide as dorsal width of one eye; with microreticulation at base between eyes; with few punctures at sides; vertex and rostrum smooth; antennomere III slightly more than twice as long as wide.

Pronotum twice as wide as long, with irregular double punctation, with very fine, shallow punctures on disc and anterior-laterally, and additionally with deeper and denser punctures on disc; setation very sparse, lateral margin lacking setae.

Metaventrite with disc smooth, and only laterally with large punctures, setation absent.

Elytra slightly more than twice as long as pronotum, with regular, sparse isodiametric structures on disc in anterior half, posteriorly smooth, on sides with long setae about as long as diameter of punctures of isodiametric structure, disc lacking setae. Posterior angles carinate, but not protuberant.

Abdomen. Composite tergite (IV–VI) with large basal cavity delimited posteriorly by straight border and two well-defined, oblique, lateral carinae. Paratergites of composite tergite well-developed, widest basally, bearing four trichomes: two large triangular trichomes and two long and narrow, macroseta-like tangled trichomes, basal triangular trichomes shorter than maximum width of paratergite. Tergites VII and VIII hardly visible dorsally. First visible sternite lacking median carina but with obtuse keel, lateral depressions shallow.

Aedeagus as in Figs. 6–7 .

Sexual dimorphism. In male legs ( Fig. 4 ) with mesofemora bearing sharp, inwardly curved spines, and mesotibiae with triangular, obtuse tooth located in basal part before middle of tibiae. Female unknown.

Remarks. See remarks under the following new species. Host ant. Unknown.

Distribution. Known only from the type locality, the Malaysian province of Penang.

Figures

FIGURES 1 – 9. Habitus (1 – 3), mesofemora and mesotibia (4 – 5), and aedeagus (dorsal (6, 8) and lateral (7, 9) aspects) of Pseudacerus furcatus (1, 4, 6 – 7), P. sabahensis (2, 5, 8 – 9) and Longacerus giraffa (3). Scale bar (4 – 9) 1 mm.