Xenorthrius stevensi ( Corporaal, 1926 ) 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 : 87-90

Xenorthrius stevensi ( Corporaal, 1926) , n. comb.

( Figures 52 and 69E )

Orthrius stevensi Corporaal 1926: 180 ; 1939: 24.

Mawdsley (1995) synonymized Orthrius stevensi with Orthrius binotatus . The name stevensi is now retained and newly combined with the genus Xenorthrius . Orthrius binotatus Fischer, 1829 remains as such.

Specimens examined: Holotype: India: Type; Gopaldhara, Rungbong Vall., Sikkim, H. Stevens.; H. Stevens, Brit. Mus. 1922-307.; J.B. Corporaal: Type:, Orthrius stevensi, 1925 Corp. (♀, BMNH).

Paratypes: India: Gopaldhara, Bw., Darjeeling , 4,720ft -19, H. Stevens.; 1926 from Brit. Mus.; J.B. Corporaal: Type : Paratype: Orthrius stevensi, 1925 Corp.; Museum Paris, Coll M. Pic ( MNHN). Nurbong, Mahapuddi Vy., Darjiling, H. Stevens. -14; H. Stevens, Brit. Mus. 1922-307; J.B. Corporaal : Paratype: Orthrius stevensi, 1925 Corp. ( BMNH). At Light; Gopaldhara, Bw., Darjeeling, 4,720ft, 4-IX-16, H. Stevens.; U.S. N.M., Paratype, 42015; J.B. Corporaal: Type: Paratype: Orthrius stevensi, 1925 Corp ( NMNH). Gopaldhara, Bw., Darjeeling, 4,720ft, -19, H. Stevens.; H. Stevens, Brit. Mus. 1922-307; J.B. Corporaal : Paratype: Orthrius stevensi, 1925 Corp. ( BMNH). Gopaldhara, Bw., Darjeeling, 4,720ft, -19, H. Stevens.; J.B. Corporaal : Paratype, Orthrius stevensi, 1925 Corp.; Stevens coll. B.M. 1916-218. ( BMNH). Gopaldhara, Bw., Darjeeling, 4,720ft,16.IX-14, H. Stevens.; At Light; H. Stevens, Brit. Mus. 1922-307; J.B. Corporaal : Paratype: Orthrius stevensi, 1925 Corp. (1ex., 1ex. 2.9.1925, BMNH). Gopaldhara, Rungbong Vall., Sikkim, H. Stevens; H. Stevens, Brit. Mus. 1922-307; J.B. Corporaal : Paratype: Orthrius stevensi, 1925 Corp. (2ex., BMNH, 1ex., RGCM, 1ex., MNHN). Gopaldhara, Rungbong Vall., Sikkim, H. Stevens; J.B. Corporaal: Type : Paratype, Orthrius stevensi, 1925 Corp., ex Corporaal; Museum Paris, Coll M. Pic ( MNHN) .

Others: India: British Bootang, B. Durelk 1898; Museum Paris, ex Coll. R. Oberthur ( MNHN). Ex Musoeo, E. Hintz; Museum Paris, ex Coll. Oberthur; Kurseong ( MNHN). Kurseong; Ex Musoeo, E. Hintz; Museum Paris, ex Coll. Oberthur ( MNHN). Jalpaiguri Distr. , Bagra Kote, 2/ 300m, 16.–22.XII.1985 ; Indien, W. Bengal, Bhakta B. ( RGCM). Karponang, 2700m, 8–11.XI.1984 ; Indien, E. Sikkim, Ch.J. Rai ( NHMB) . China: China, C Tibet Guantze distr. , 3400m, VII.1999; Orthrius sp ( JSBC) .

Measurements: (19 specimens measured) Average total length: 11.3mm, range: 10.0– 13.6mm, average elytral length: 7.8mm, average elytral width: 3.5mm, average pronotal length: 2.5mm, average pronotal width: 2.5mm, average head width: 2.2mm.

Head: Black, cranium vested with short setae, punctation relatively strong, interstices irregular, about one diameter of punctures; interocular depressions strongly developed, posterior part of clypeus dark red-brown to black, margins darkened, anterior margin concave, with large punctation and a few long setae laterally, smooth centrally; ventral part dark red-brown, wrinkled, smooth centrally; antennae light red-brown, lighter then head capsule, 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 parallel, gular process broad.

Thorax: Average pronotal length:width ratio 1.0:1; pronotum broadest centrally, dark red-brown to black, anteriorly lighter, sparsely vested with short yellowish setae, with dense punctation on pronotal disc, diameter of punctures variable, prosternum smooth; mesosternum vested with yellowish setae; metasternum vested with fine setae; anterior metasternal process with two strongly sclerotized, ventrally projecting, edges; scutellum circular, colored like surrounding elytra.

Elytra: Average length:width ratio 2.3:1; basal two thirds dorsally surrounded dark red-brown, one dark red-brown spot on each elytron in basal half, one broad red-brown postmedian fascia, lateral margins yellow, coloration very variable, basal two thirds can be entirely dark red-brown, apex always yellow, rectangular subcutaneous structures visible through lighter areas, vested with short decumbent and few longer erect setae, punctation relatively small, striae 1 obsolete after dark spot in basal half, striae 1 to 6 becoming continuously longer until striae 6 reaches anterior margin of postmedian fascia, striae 7 and 8 as long as striae 6, striae 9 and 10 with very weak punctation, interstices between striae about one diameter of punctures, interstices within striae smaller than one diameter of punctures; punctation slightly rasp-like, carination absent.

Legs: Yellow, tarsi slightly darker, tarsal pulvilli pale; metatibiae more or less straight, tibiae not carinated.

Abdomen: Male and female ventrite 6 yellow, punctation distinct, interstices about one diameter of punctures. Male pygidium subovate; male ventrite 6 extremely emarginate in a broad and deep U-shape. Male genitalia ( Fig. 52 ): Dorsal sclerotization of tegmen apically conspicuously dilated; phallic plates broad; spicular fork dividing into two branches after two fifths of length.

Distribution: India, Tibet.

Seasonal occurrence: Collected from July to December.

Figures

FIGURE 52. Xenorthrius stevensi: (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.