Xenorthrius subapicalis Pic, 1927

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 : 91-94

publication ID	https://doi.org/ 10.11646/zootaxa.2584.1.1
persistent identifier	https://treatment.plazi.org/id/03F45644-0161-FF88-6FD3-F8B1DD78B36E
treatment provided by	Felipe
scientific name	Xenorthrius subapicalis Pic, 1927
status

Treatment

( Figures 54 View FIGURE 54 and 70A View FIGURE 70 )

Xenorthrius subapicalis Pic 1927: 7 .

Xenorthrius tricoloratus Pic 1951: 12 n. syn. Specimens examined: Holotype ( X. subapicalis ): Vietnam: Tonkin, Chapa, 30.IV–1918, Jeancoine; Type; Xenorthrius subapicalis, Pic ; Type; Museum Paris, Coll. M. Pic (♀, MNHN). Holotype ( X. tricoloratus ): Vietnam: Tonkin, P. Lemée, 1903–1906; Xenorthrius tricoloratus n sp; Museum Paris, Coll. M. Pic (♀, MNHN) Xenorthrius tricoloratus n. syn.

Others: Vietnam: 17.– 21.5.1990 Tam Dao, Vinh Phu Distr. , N Vietnam 900m, Jan Horák Leg (1ex., 1ex. 6.– 10.5.1990, NMPC). N-Vietnam, 75 km nw Hanoi, Tam Dao, 15.5.– 16.6.1991, leg. E. Jendek (3ex., RGCM) .

Measurements: (7 specimens measured) Average total length: 9.0mm, range: 8.3–9.7mm, average elytral length: 6.0mm, average elytral width: 2.7mm, average pronotal length: 2.5mm, average pronotal width: 2.1mm, average head width: 1.9mm.

Head: Black, cranium vested with long setae, punctation weak but distinct, interstices among punctation minimal one diameter of punctures; posterior part of clypeus black, anterior margin concave, posterior margin convex, with large punctation and a few long setae laterally, smooth centrally; ventral part smooth except wrinkles behind the eyes; antennae red-brown, 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, gular process narrow.

Thorax: Average pronotal length:width ratio 1.2:1; pronotum black, densely vested with yellow setae, pronotal arch broad, punctation fine, interstices among punctation larger than diameter of punctures, pronotum proper with coarse and dense punctation, punctation large, interstices among punctation smaller than diameter of punctures, punctation often merging to longitudinal wrinkles; prosternum red-brown, smooth; mesosternum red-brown, margins darkened, vested with yellowish setae; metasternum red-brown, vested with fine setae, punctation sparse and fine; transverse sulcus on anterior part of mesosternum and mesepisternum relatively distinct on mesosternum, anterior metasternal process with two strongly sclerotized, ventrally projecting, edges; scutellum oval, dark red-brown.

Elytra: Average length:width ratio 2.0:1; basal third red, followed by a narrow yellow fascia, postmedian fascia broad, black, near apex another yellow fascia but elytral suture is black, extreme apex black, circular subcutaneous structures visible through yellow areas, densely vested with short decumbent and longer erect setae, punctation relatively large, striae 1 to 3 obsolete with beginning of yellow fascia, striae 4 reaches black postmedian fascia, striae 5 to 7 crossing postmedian fascia, striae 8 weak or obsolete behind basal red area, striae 9 and 10 hardly visible, interstices between striae equal diameter of punctures, interstices within striae smaller than diameter of punctures; punctation only slightly rasp-like in humeral region, slightly carinated next to striae 4 to 6 in postmedian fascia.

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

Abdomen: Ventrites black, punctation sparse and fine; male pygidium broadest basally, lateral margins strongly converging apically; male ventrite 6 only slightly emarginate. Male genitalia ( Fig. 54 View FIGURE 54 ): Tegmen dilated apically, sinus broadly V-shaped; phallic plates extremely narrow, tip broader and stronger sclerotized, with horizontal furrow; spicular fork dividing into two branches after one third of length.

Distribution: Vietnam.

Seasonal occurrence: Collected from April to June.

The metatibiae of the holotype of X. subapicalis are extremely bent; despite that it is synonymized with Xenorthrius tricoloratus Pic, 1951 which has straight tibiae. Presumably the tibiae of this specimen were deformed by external mechanical influences. Maybe some incident occurred while moulting or the deformations are the result of postmortem treatment. This suggestion is supported through the differently, not symmetrically bent tibiae. Furthermore there are some unnatural looking wrinkles that seem to be caused by crimped cuticle material. Unfortunately both holotypes were females and the ovipositors do not differ.