Plateros sarmentosus Kazantsev sp.n.

Figs 37, 97–98.

MATERIAL: Holotype, ♂, N Vietnam, Cuc Phuong, 2– 11.V.1991, J. Strnad leg. (ICM).

DESCRIPTION. Male. Dark brown to black; antennomeres 2 and proximal palpomeres light brown; pronotum, scutellum and elytra testaceous (Fig. 37).

Vertex with conspicuous round impression behind antennal prominence. Eyes large, interocular distance ca. 1.6 times shorter than eye diameter. Labrum small, transverse, truncate anteriorly. Palps slender; ultimate palpomeres considerably longer than wide, sub-oval, narrow, obliquely truncate and flattened at apex. Antennal sockets separated by minute lamina. Antennae attaining to elytral two thirds, strongly pilose; dent of antennomere 4 ca. 2.3 times shorter than stem; antennomere 3 ca. 2.5 times longer than antennomere 2 and ca. 1.5 times shorter than antennomere 4; antennomeres 3–11 with moderately long erect pubescence (Fig. 37).

Pronotum transverse, ca.1.5 times wider than long, slightly trapezoidal, with slightly concave sides, moderately bisinuate basally and strongly triangularly produced anteriorly, with acute, somewhat protruding laterally posterior and blunt anterior angles. Scutellum transverse, parallel-sided, slightly incised at apex (Fig. 37).

Elytra moderately long, only ca. 3 times longer than wide at humeri, parallel-sided; with four prominent, almost equally developed primary costae, noticeably stouter than secondary ones; interstices with even rows of irregular roundish cells; pubescence dense, short and decumbent (Fig.).

Legs slender; femoris and tibiae narrow, subequal in length (Fig. 37).

Aedeagus symmetrical, with narrow phallobase and contiguous phallobasal lateral plates; median lobe straight and narrow, only slightly bent left in lateral view, equipped with paired mustache-like distal armament (Figs 97–98).

Female. Unknown.

Length: 5.2 mm. Width (humerally): 1.4 mm.

ETYMOLOGY. The name of the new species is derived from the Latin for ‘with mustache’, alluding to the armament of the median lobe of its aedeagus.

DIAGNOSIS. Plateros sarmentosus sp.n. may be distinguished from the somewhat similar-looking P. planatus by the pilose antennae (Fig. 37) and mustache-like armament of the straight and narrow median lobe of its aedeagus (Figs 97– 98).

DISTRIBUTION. Northern Vietnam: Cuc Phuong.