Sulcolotis xanthomarginalis Liu & Wang sp. nov.

(Figs 4a–g)

Diagnosis: This species can be distinguished from S. seminigra Miyatake and S. ovalis sp.nov by the nearly entirely black elytron.

Description. TL: 2.31–2.79mm, TW: 1.75–2.18mm, TH: 1.25–1.82mm, TL/TW: 1.28–1.32; PL/PW: 0.23– 0.24; EL/EW: 1.05–1.10; HW/PW: 0.71–0.73; PW/TW: 0.66–0.67; HW/TW: 0.47–0.48; Eye W/HW: 0.40–0.45.

Head and pronotum yellowish brown. Scutellar shield, and elytra blackish brown with yellowish brown margin. Underside yellowish brown; except metaventrite and the middle part of ventrite 1 reddish brown.

Body rounded, strongly convex (Figs 4b, c). Head 0.48 times of elytral width (HW/TW=1:2.1), with sparse pubescence. Eyes finely faceted, interocular distance 0.43 times of head width. Frons broad, punctures uniform and dense (Figs 4c, d).

Pronotum 0.67 times of elytral width (PW/TW=1:1.5), moderately transverse, punctures uniform (Figs 4a, c). Elytra with uniform and dense punctures (Figs 4a–c).

Ventrite 6 subhemisphenical and posterior margin of ventrite 7 at middle strongly concave (Fig. 4g).

Male genitalia: Penis relatively short, pointed and apically curved, capsule with nearly same length of inner and outer arm; tegmen with penis guide distinctly shorter than parameres, in lateral view widest, then gradually tapering to apex; penis guide in ventral view gradually narrowing to apex.

Type material. Holotype: ♂, Philippines, Mt. Makiling, Luzon, Baker (USNM) . Paratype: 2♂ 2♀, same data as holotype (USNM); 1♀, Philippines Malinao Tayabas Baker (USNM); 1♀, Philippines, S Luzon Quezon N. P (Lucena) 8–10. Jan. 1991 Bolm lgt., 250m (ANIC) .

Distribution. Philippines (Luzon).

Etymology. The specific epithet is formed from the Greek noun Xanthus and Latin noun marginatus, referring to elytra with yellowish margin.