Labomimus foveolatus ( Raffray, 1882 ) Raffray, 1882

Yin, Zi-Wei & Li, Li-Zhen, 2015, Review of some species in the genera Pselaphodes Westwood and Labomimus Sharp (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4040 (3), pp. 331-344 : 332-335

2. Labomimus foveolatus ( Raffray, 1882) , new combination

( Fig. 2 )

Atherocolpus foveolatus Raffray, 1882: 15 .

Material examined. 1 ♂ (in BMNH), labeled ( Fig. 2 B) ‘♂ Pselaphodes foveolatus Raff. sud.(?) auth. Singapore Raffray (handwritten) / Sharp Coll. 1905-313. (printed) / Labomimus foveolatus (Raff.) ♂, Z.-W. Yin det. 2015’.

Diagnosis of male. Light reddish brown; body length over 2.8 mm; postgenae short, broadened laterally, densely setose at posterolateral margins; antennal club composed of enlarged antennomeres IX–XI, antennomere IX modified; pronotum angularly expanded laterally; metathorax with long metaventral processes; protibiae protuberant near apices; aedeagus with slightly asymmetric median lobe.

Redescription of male. Habitus as in Fig. 2 A. Body length 2.87 mm. Head slightly wider than long, HL 0.54 mm, HW 0.57 mm, postgenae densely setose at posterolateral margins; each eye composed of about 40 facets. Distinct antennal club composed of three apical antennomeres, antennomere IX protuberant at apicomesal margin ( Fig. 2 C). Pronotum as long as wide, PL 0.56 mm, PW 0.55 mm, with lateral margins angularly expanded, disc with distinct median longitudinal sulcus. Elytra wider than long, EL 0.79 mm, EW 1.06 mm. Metaventral processes ( Fig. 2 F) long, apically slightly curved ventrally, with truncate apex. Legs simple, except for protibiae which are protuberant at mesal margins near apices ( Fig. 2 D). Abdomen broad at base and narrowed posteriorly, AL 0.98 mm, AW 1.04 mm. Length of aedeagus 0.39 mm; aedeagus ( Figs 2 G, 2H) with slightly asymmetric median lobe, endophallus composed of single elongate sclerite.

Comparative notes. This species is here moved from the genus Pselaphodes to Labomimus based on the presence of the median metaventral fovea ( Fig. 2 E). The combination of the densely setose postgenae, elongate antennal club with antennomere IX protuberant at the anteromesal margin, elongate metaventral processes, and protuberant apicomesal margin of the protibiae is unique within the genus. When combined with the structures of the aedeagus, Labomimus foveolatus can be readily separated from all other congeners.

Distribution. This species is currently known only from Singapore.

Figures

FIGURE 2. Labomimus foveolatus, male. A. Dorsal habitus. B. Labels of the specimen. C. Antennal club. D. Protibia. E. Meso- and metaventrite. F. Metaventral process. G. Aedeagus, in dorsal view. H. Same, in lateral view. Scales: A = 1.0 mm; E = 0.5 mm; C, D, F = 0.3 mm; G, H = 0.2 mm.