Xenorthrius procerus 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 : 71-72

Xenorthrius procerus Gerstmeier & Eberle, 2010 nom. nov.

( Figures 43 and 68B )

Xenorthrius elongatus Miyatake 1985: 156 .

The name Xenorthrius elongatus Miyatake, 1985 , is a junior secondary homonym and has to be renamed. Unfortunately no type material was available for this species.

Specimens examined: Japan: (Is. Amami), Shinokawa, 16.VI.1997, S. Yoshimichi leg.; ♀; Xenorthrius elongatus Miyatake, 1985 (EUMJ). Fukumoto: Amami-oshima Is., Kagoshima, Japan, 27.VI.1992, Hisao Nishino leg.; Xenorthrius elongatus Miyatake, 1985 (KSCT). Akatuchu-yama, Amami-oshima ls., Kagoshima, JPN, 3.VII.1997, Masao Ito leg.; Xenorthrius elongatus (RGCM) . Yuwan, Amami-oshima, Kagoshima, Japan, 26.VI.1998, Masao Ito leg; Xenorthrius elongatus Miyatake 1985 , det. K. Sakai (RGCM). Santaro-Pass, Amami S., 30.V. 1960, T. Shibata; ♂; Xenorthrius elongatus Miyatake, 1985 (EUMJ). (Is. Amami), Shinokawa, 15.VI.1997, S.Yoshimichi leg.; ♂; Xenorthrius elongatus Miyatake, 1985 (EUMJ). Mt.Yuwan, Amami, 6.V.1977, M. Sakai & A. Oda; ♀; Xenorthrius elongatus Miyatake, 1985 (EUMJ). Japan: Kagoshima pref. Ryugo, Honshu-pass, Amami Oshima Is., 1.vi.2007; S. Fukida; Clerinae , Xenorthrius elongatus Miyatake, 1985 (JSBC). Japan: Kagoshima Pref., Amamioshima Is., Juyou Village, Santaro, 11.v.2002 – S. Fukida; Cleridae , Xenorthrius elongatus Miyatake, 1985 (JSBC). Nakanoshima Is., Tokara Iss., Kagoshima, JPN, 20.VII.2000, Masao Ito leg.; Xenorthrius elongatus (KSCT) .

Measurements: (10 specimens measured) Average total length: 10.0mm, range: 9.3–11.4mm, average elytral length: 6.7mm, average elytral width: 2.5mm, average pronotal length: 2.2mm, average pronotal width: 2.0mm, average head width: 1.9mm.

Head: Dark red-brown, cranium vested with short setae, with relatively coarse punctation; posterior part of clypeus red-brown, anterior margin slightly emarginate, poster margin convex, with large punctation and a few long setae laterally, smooth centrally; ventral part red-brown, smooth, except wrinkles behind the eyes; antennae red-brown, becoming lighter towards tip, A4 longer than A3, antennomeres gradually decreasing in length from A4 towards A8, A9 to A11 forming a distinct club, A9 slightly separated from A10 and A11, male A11 reaching beyond pronotal base when antennae laid back; gular sutures diverging apically, gular process narrow.

Thorax: Average pronotal length:width ratio 1.1:1; pronotum dark red-brown, pronotal arch dorsally lighter, vested with short yellowish setae, pronotal arch with sparse punctation, somewhat coarser laterally, interstices about one diameter of punctures, pronotum proper with weak punctation, interstices smaller than diameter of punctures; pro-, meso- and metasternum red-brown, pro- and mesosternal margins slightly darkened, prosternum without vestiture, surface smooth; meso- and metasternum vested with yellow setae, metasternum sparsely punctured; anterior metasternal process with two small, ventrally projecting, edges; scutellum round, colored like elytra.

Elytra: Average length:width ratio 2.7:1; coloration uniformly red-brown, often very dark and more reddish, then suture distinctly lighter, vested with short decumbent setae, punctation relatively large, all striae distinctly visible on entire surface, interstices between and within striae smaller than one diameter of punctures, punctation never rasp-like, carination absent.

Legs: Red-brown, coxa and trochanter yellow, tarsal pulvilli pale, legs relatively long; metatibiae slightly bent distally, anterior and posterior face of each tibia carinate, carination dark red-brown, distinct, especially on metatibia.

Abdomen: Ventrites red-brown, with distinct punctation, interstices larger than diameter of punctures; male pygidium ovate; posterior margin of male ventrite 5 with a wide U-shaped emargination, female ventrite 5 not conspicuously emarginate; male ventrite 6 with a slight V-shaped emargination. Male genitalia ( Fig. 43 ): Tegmen apical rounded, ventral sinus narrow and deep; spicular fork dividing into two branches after one fifth of length.

Distribution: Japan (Amamioshima, Nakanoshima).

Seasonal occurrence: Collected dates from May to July.

Etymology: The specific epithet, procerus , a Latin adjective meaning elongate, refers to the elongate habitus.

Figures

FIGURE 43. Xenorthrius procerus: (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.