Xenorthrius penangis 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 : 65-66

Xenorthrius penangis Gerstmeier & Eberle, 2010 n. sp.

( Figures 2A , 40 and 68A )

Specimens examined: Holotype: W-Malaysia: W-Malaysia, Pahang, Baniaran Benom Mts. , K. Ulu Dona, 10–15km SSE, 17.– 23.4.1997 leg. Hauck (♂, RGCM).

Paratypes: Thailand: Thailand, Soppong Pai 1.– 8.5.1993 Pacholatko & Dembicky leg. (RGCM). Malaysia: Penang, Xenorthrius ephippiatus Gorh. ; Xenorthrius ephippiatus Gorham, S. Schenkling det. (BMNH). Penang; Bowring; Schenkling det. (SDEI). W-Malaysia, Pahang, Baniaran Benom Mts., K. Ulu Dona, 10–15km SSE, 17.- 23.4.1997 leg. Hauck (5ex., RGCM). Malaya Selangor, Gombak For. Res.; 15 Apr. 1961, H.E. McClure, tree platform; Xenorthrius umbratus Schklg , det. G. Ekis, 1983 (NMNH).

Measurements: (10 specimens measured) Average total length: 8.4mm, range: 7.8–9.8mm, average elytral length: 5.6mm, average elytral width: 2.6mm, average pronotal length: 2.4mm, average pronotal width: 2.0mm, average head width: 1.9mm.

Head: Red-brown, cranium densely vested with shorter and longer setae, punctation relatively dense, interstices irregular; posterior part of clypeus red-brown, anterior margin centrally emarginate, especially with very long setae laterally, few large punctures; ventral part wrinkled, smooth centrally; antennae red-brown, antennomeres slightly lighter apically, antennomeres gradually decreasing in length from A3 towards A8, A9 to A11 forming a distinct club, antennae not reaching base of pronotum when laid back; gular sutures diverging apically, deep sulci next to gular sutures, gular process extremely narrow, terminally dilated.

Thorax: Average pronotal length:width ratio 1.2:1; pronotum red-brown, densely vested with yellow setae, pronotal arch broad, punctation weak dorsally, interstices about one diameter of punctures, pronotum proper with coarse, dense and large punctation, interstices smaller than diameter of punctures, punctation often merging to longitudinal wrinkles; prosternum red-brown, smooth; mesosternum red-brown; metasternum distinctly darker, punctation fine but distinct, interstices about 3 times diameter of punctures; anterior metasternal process with two strongly sclerotized, ventrally projecting, edges; scutellum oval, colored like surrounding elytra.

Elytra: Average length:width ratio 2.2:1, elytra uniformly red-brown except a more or less definite yellow fascia before the middle, subcutaneous structures visible through yellow areas, vested with short decumbent and longer erect setae, punctation relatively large, striae 1 and 2 obsolete with beginning of yellow fascia, remaining striae present all over the elytra but becoming weaker to the apex, interstices between striae about one half diameter of punctures, interstices within striae smaller; punctation often rasp-like in humeral region, very slightly carinated along striae 5 and 6 in third quarter.

Legs: Red-brown, coxa, trochanter and proximal part of femora yellow, tarsal pulvilli pale; metatibiae more or less straight, anterior and posterior face of each tibia carinate, carination dark red-brown, distinct on all tibiae.

Abdomen: Ventrites red-brown, becoming lighter towards apex, punctation sparse and fine; male pygidium rounded, lateral margins slightly converging, arms short; male ventrite 6 with U-shaped emargination, female ventrite 6 also with slight emargination. Male genitalia ( Fig. 40 ): Tegmen slightly dilated apically, sinus broadly V-shaped; phallic plates broad, in ventral view phallic plates are emarginate on the left side right before the tip; spicular fork dividing into two branches after one fifth of length.

Distribution: Thailand, Malaysia.

Seasonal occurrence: Collected in April and May.

Etymology: Named after the Malaysian city Penang.

Figures

FIGURE 2. Gular process: (A) Xenorthrius penangis and (B) Xenorthrius umbratus.

FIGURE 40. Xenorthrius penangis: (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 68. Habitus photographs: Xenorthrius penangis n. sp. (A), Xenorthrius procerus (B), Xenorthrius prolongatus (C), Xenorthrius robustus (D), Xenorthrius rubicollis n. sp. (E) and Xenorthrius rubris n. sp. (F). Scale bars = 4mm.