Xenorthrius scordalus Gerstmeier & Eberle, 2010

Gerstmeier, Roland & Eberle, Jonas, 2010, Revision of the Indo-Australian checkered beetle genus Xenorthrius Gorham, 1892 (Coleoptera: Cleridae, Clerinae) 2584, Zootaxa 2584 (1), pp. 1-121 : 83

Xenorthrius scordalus Gerstmeier & Eberle, 2010 n. sp.

( Figures 7 , 49 and 69B )

Specimen examined: Holotype: Myanmar: N-Burma, ca. 50 km nw, Putau , 12.8.2006, 2200m, leg. C. Reuter; Xenorthrius (♂, RGCM).

Measurements: (1 specimen measured) Total length: 12.6mm, elytral length: 8.4mm, elytral width: 3.7mm, pronotal length: 3.3mm, pronotal width: 3.0mm, head width: 2.7mm.

Head: Black, cranium densely vested with very short setae, vested with shorter setae, with coarse, dense and large punctation, interstices smaller one diameter of punctures; posterior part of clypeus black, with long setae laterally; ventral part wrinkled, smooth centrally; antennae basally black, becoming lighter towards tip, which is red-brown, A4 longer than A3, antennomeres gradually decreasing in length from A4 towards A8, A9 to A11 forming a distinct club, antennae reaching base of pronotum when laid back; gular sutures diverging apically, gular process relatively broad.

Thorax: Average pronotal length:width ratio 1.1:1; pronotum black, vested with short yellowish setae, pronotal arch with distinct punctation, interstices about one diameter of punctures, pronotum proper with coarse and dense punctation, interstices distinctly smaller than one diameter of punctures; prosternum black, smooth; mesosternum black, sparsely vested with yellowish setae; metasternum black, vested with fine setae, coarse sclerotization near discriminal line; anterior metasternal process with two strongly sclerotized, ventrally projecting, edges; scutellum oval, black.

Elytra: Average length:width ratio 2.3:1; apex dentate ( Fig. 6A ), base narrowly black, remainder uniformly red, subcutaneous structures only slightly visible, sparsely vested with short decumbent and few longer erect setae, punctation relatively small, additional punctation between striae 1 and 2 in humeral region, striae 1 obsolete after basal fifth, striae 1 to 5 becoming constantly longer until striae 5 are nearly entirely present, striae 6 as long as striae 5, striae 7 and 8 shorter, striae 9 and 10 with very weak punctation, interstices between striae one half diameter of punctures, interstices within striae smaller; punctation rasp-like from anterior in basal third, carination absent.

Legs: Yellow, coxae black, tibiae distally slightly black, tarsi red-brown, tarsal pulvilli pale, sometimes slightly darkened; metatibiae more or less straight, tibiae not carinated.

Abdomen: Ventrites red, with relatively dense punctation, interstices about one diameter of punctures; male pygidium oval, dorsally only few longer setae, ventrally densely vested with very short setae ( Fig. 49E ); male ventrite 5 with broad V-shaped emargination, laterally projecting ventrally; male ventrite 6 with broad but shallow emargination. Male genitalia ( Fig. 49 ): Tegmen dilated apically, parameres bent to ventral, sinus very broad and deep; phallic plates broad, tip narrow; spicular fork dividing into two branches after quarter of length.

Distribution: Myanmar.

Seasonal occurrence: Collected in August.

Etymology: The specific epithet, scordalus , a Latin noun meaning quarrelsome devil, refers to the robust appearance of the one known specimen of this species.

Figures

FIGURE 6. Elytral apices: (A) dentate (Xenorthrius truncatus), (B) dehiscent (Xenorthrius prolongatus) and (C) rounded (Xenorthrius geniculatus).

FIGURE 7. Xenorthrius scordalus: rasp-like punctation in basal half of elytra.

FIGURE 49. Xenorthrius scordalus: (A) Tegmen in ventral view, (B) phallus in ventral view, (C) tip of aedeagus in lateral view, (D) spicular fork, (E) male pygidium, (F) male ventrite 6 and distribution map.

FIGURE 69. Habitus photographs: Xenorthrius rufotestaceus (A), Xenorthrius scordalus n. sp. (B), Xenorthrius simplex (C), Xenorthrius stefanieae n. sp. (D), Xenorthrius stevensi (E) and Xenorthrius striatulus (F). Scale bars = 4mm.