Erymus filiformis nov.sp.

(Figs 16-18)

Examined material: Holotype ♂: Thailand, Khao Yai Nat. Park, Nakkon Ratchasima, Pha Kluai Mai, 650 m, Maruyama & Katayama 27.IX-4.X.2007 (cH); paratypes: same data, 1♀ (cH), 1♂ (cB).

Description: Length of body 4.4 mm; from anterior margin of head to posterior margin of elytra: 2.3 mm. Body slender, narrow, brown yellowish; antennae brown with the first 3 articles yellowish pale; legs yellowish pale, semitransparent. Head ovoid, with a little rounded sides and largely rounded posterior angles. Eyes large and very protruding. Surface of head with some very fine and sparse punctures. Pronotum a little longer and narrower than head, with oblique anterior margins, largely rounded anterior angles and slightly sinuate sides. Surface with dorsal series of 5 very spaced, fine punctures and lateral series sof 3-4 punctures. Elytra long, dilated posteriad, very longer and wider than pronotum, with marked humeral angles. Surface a little wrinkled, with three series of very fine punctures, one juxtasutural, one median and one lateral. Abdomen with traces of fine, transverse micro-striation and fine, spaced punctation.

Tergite and sternite of the male genital segment as in Figs 16-17. Aedeagus (Fig. 18) 0.85 mm, ovoid truncate, with very long parameres; inner sac with a tufts of fine, distal spinulae, followed by a broad area covered with fine scales.

Etymology: The specific epithet is the Latin filiformis- e (filiform), in relation to the slender body.

Distribution: The species is known only from the type locality.

Remarks: This species differs from the congeners by the slender, narrow body, the color of the antennae and legs, and the structure of the inner sac of the aedeagus.